Quadrilaterals and Triangles

Part One:

Rectangles, Squares

Quadrilaterals

• Rectangles • Squares

1. Draw It

2. Tell me about the sides (parallel, perpendicular, congruent)

3. Tell me about the angles (acute, obtuse, right)

Perimeter and area

• Perimeter: – Distance around a shape

– Units are linear, such as inches or centimeters.

• Area:– Space in a shape

– Units are square units, such as square inches or square centimeters.

Formulas for squares, rectangles, and parallelograms

• Formula for finding perimeter P = 2(base + height)

• Formula for finding areaA = (b)(h)

Which are 4-sided polygons? • Quadrilaterals• Triangles• Rectangles• Pentagons• Squares• Rhombus• Pyramid• Hexagons

• Prism• Kite• Circles• Trapezoid• Cubes• Octagon• Parallelogram• Cylinder

Part 2: Triangles

How are they related to parallelograms?

Can you split these shapes in half by drawing a diagonal

line?

How is a triangle different?

How do we find perimeter and area?

Formula

• Area of parallelograms, rhombus, rectangle, square = (base)(height)

• Area of triangles = (base)(height)1

2

What if it is not a right triangle?

Find the right ( ) Altitude.⊥