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Finding Area of Triangles and Trapezoids

This topic covers the concept of finding area of triangles and trapezoids, finding a missing measurement along with some word problems.

Topic: Area of Triangles and Trapezoids

  • The area of a triangle or a trapezoid can be thought of as half the area of a parallelogram

  • Area of a triangle = 1/2 (Base) x (Height)

  • Area of a trapezoid = 1/2 (Sum of the parallel sides) x (Height), or Area = 1/2 (b1 + b2) x h

Topic: Area on a Coordinate Plane

  • To find the area of a figure on the coordinate plane, we first need to plot the figure on the graph

  • Area of a triangle = 1/2 (Base) x (Height)

  • Area of a trapezoid = 1/2 (Base1 + Base2) x (Height)

  • The base and height of a triangle graphed on a coordinate plane can be calculated by counting the number of squares. For example, the base along 6 squares is 6 units long
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