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12.3 Lateral and Surface area Pyramids and Cones ink.notebook
1
May 01, 2017
Page 159
12.3 Surface Area of Pyramids and Cones
Page 160
Page 161 Page 162Page 163
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
Lesson Objectives Standards Lesson Notes
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12.3 Surface Areas of Pyramids and Cones
Lesson Objectives
Press the tabs to view details.
Lesson NotesStandards
After this lesson, you should be able to successfully find the lateral area and surface area of pyramids and cones.
Lesson Objectives Standards Lesson NotesG.MG.1 Use geometric shapes, their measures, and their properties to describe objects.G.GMD.4 Identify the shapes of twodimensional cross sections of threedimensional objects, and identify threedimensional objects generated by rotations of twodimensional objects.G.GMD.1 Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone.G.MG.2 Apply concepts of density based on area and volume in modeling situations.
Lateral and Surface Areas of Pyramids A ______________ is a solid with a polygon base. The lateral faces intersect in a common point known as the vertex.The altitude is the segment from the vertex that is perpendicular to the base. For a __________________________, the base is a regular polygon and the altitude has an endpoint at the center of the base. All the lateral edges are congruent and all the lateral faces are congruent isosceles triangles. The height of each lateral face is called the _______________________.
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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¬Surface Area of a Regular Pyramid: The surface area SA of a regular pyramid is , where ¬ is the slant height, P is the perimeter of the base, and B is the area of the base.
¬Lateral Area of a Regular Pyramid: The lateral area LA of a regular pyramid is , where ¬ is the slant height and P is the perimeter of the base.
Example For the regular square pyramid above, find the lateral area and surface area if the length of a side of the base is 12 centimeters and the height is 8 centimeters. Round to the nearest tenth if necessary.Find the slant height.
¬2 = 62 + 82 ¬ =
LA = _____________
B = _______,
SA = ___________
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
1.
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.2.
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.3.¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.4.¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
Lateral and Surface Areas of Cones A cone has a circular base and a vertex. The axis of the cone is the segment with endpoints at the vertex and the center of the base. If the axis is also the altitude, then the cone is a right cone. If the axis is not the altitude, then the cone is an oblique cone.
Lateral Area of a Cone: The lateral area L of a right circular cone is L = πr¬, where r is the radius and ¬ is the slant height.
Surface Area of a Cone: The surface area S of a right cone is S = πr¬ + πr2, where r is the radius and ¬ is the slant height.
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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¬ = _________
LA = ____________
Area of base = __________
SA = ____________
¬ = _________
LA = ____________
Area of base = __________
SA = ____________
¬ = _________
LA = ____________
Area of base = __________
SA = ____________
5. 6. 7.
Find the lateral area and surface area of each cone. Round to the nearest tenth if necessary.
On the Worksheet
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.A)
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.B)
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
HOMEWORK12.3 More Practice on Surface Areas of Pyramids and Cones
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
1.
Exercises Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth if necessary.
¬ = ________
P = _____________
LA = _____________
B = _____________
SA = _____________
2.
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
Find the lateral area and surface area of each cone. Round to the nearest tenth if necessary.
¬ = _________LA = ____________
Area of base = __________
SA = ____________
3.
Find the lateral area and surface area of each cone. Round to the nearest tenth if necessary.
¬ = _________LA = ____________
Area of base = __________
SA = ____________
4.
5. Find the surface area of a cone if the height is 14 centimeters and the slant height is 16.4 centimeters.
6. Find the surface area of a cone if the height is 12 inches and the diameter is 27 inches.
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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7. HATS Chad bought a conical hat on a recent trip to central Vietnam. The basic frame of the hat is 16 hoops of bamboo that gradually diminish in size. The hat is covered in palm leaves. If the hat has a diameter of 50 centimeters and a slant height of 32 centimeters, what is the lateral area of the conical hat?
Find the Lateral Area and Surface Area. Round to the nearest tenth if necessary.
15 m
17 m
L. A. = __________
S. A. = __________
8.
5 in
24 in
9.
L. A. = __________
S. A. = __________
Find the Lateral Area and Surface Area. Round to the nearest tenth if necessary.
L. A. = __________
S. A. = __________
L. A. = __________
S. A. = __________
10. 11.13 cm
10 cm5 m
5 m
12 m
Find the Lateral Area and Surface Area. Round to the nearest tenth if necessary.
L. A. = __________
S. A. = __________
L. A. = __________
S. A. = __________
12. 13.
9 m
20 m
9 m3 m
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
Find the Lateral Area and Surface Area. Round to the nearest tenth if necessary.
L. A. = __________
S. A. = __________
L. A. = __________
S. A. = __________
14. 15.
45 m
65 m
32 m
34 m
32 m
Find the Lateral Area and Surface Area. Round to the nearest tenth if necessary.
L. A. = __________
S. A. = __________
16.
12 in8 in
Answers:1. 10 yd, 36 yd, 180 yd2, 81 yd2, 261 yd2
3. 6.4 m, 80.4 m2, 50.2 m2, 130.6 m2
5. 664.6 cm2 7. 2512 cm2 9. 489.9 in2, 942.0 in2
11. 260 cm2, 360 cm2 13. 289.7 m2, 353.3 m2
15. 7215 m2, 11440 m2
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017
12.3 Lateral and Surface area Pyramids and Cones ink.notebook
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May 01, 2017