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Area:Triangles
andTrapezoids
6th Grade Mathematics
Mr. Wong
Area of a Triangle
b
h
Area = 1/2 • base • height
Area = 1/2 • b • h
The area of a triangle is
half that of a rectangle.
Ex. 1 Find the area of the triangle.
13.6m
7m
Area = 1/2 • base • height
Area = 1/2 • b • h
Area = 1/2 • 13.6 • 7
Area = 6.8 • 7
Area = 47.6 m2
Ex. 2 Find the area of the triangle.
Area = 1/2 • base • height
Area = 1/2 • b • h
Area = 1/2 • 12 • 5
Area = 6 • 5
Area = 30 in2
Area of a Trapezoid
Area = 1/2 • height • (base1 + base2)
Area = 1/2 • h • (b1 + b2)
b1
b2
h
Ex. 3 Find the area of the Trapezoid.
Area = 1/2 • height • (base1 + base2)
Area = 1/2 • h • (b1 + b2)
3 in
7 in
3 in
Area = 1/2 • 3 • (3 + 7)
Area = 1/2 • 3 • (10)
Area = 1.5 • (10)
Area = 15 in2
Ex. 4 Find the area of the Trapezoid.
Area = 1/2 • height • (base1 + base2)
Area = 1/2 • h • (b1 + b2)
Area = 1/2 • 9 • (4 + 10)
Area = 1/2 • 9 • (14)
Area = 4.5 • (14)
Area = 63 m2
