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Area of a Triangle, and a Trapezoid

In this topic, we will learn to compute the area of a triangle, and a trapezoid. This topic will also cover the area of composite figures.

Topic: Area of a Triangle

  • Any parallelogram can be divided into two congruent triangles. The area of each triangle is half of the area of the parallelogram

  • Area of a parallelogram = Base x Height

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

  • Area is measured in square units

Topic: Area of a Trapezoid

  • Area of a trapezoid = 1/2 x Area of a parallelogram

  • Area of a trapezoid = 1/2 x (Base a + Base b) x height
    Or, A = 1/2 x (a + b) x h

  • Area is measured in square units

Topic: Area of Composite Figures

  • A composite figure is a shape made up of two or more shapes

  • One way to calculate the area of composite figures is to think of it in simpler parts. Add the areas of the simpler parts to find the area of the composite figure

  • Area of a Rectangle = Length x Width; Area of a square = Side x Side

  • Area is measured in square units
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