Area of polygons by decomposing into rectangles and triangles
Split the shape into rectangles and triangles. Find each area, then add them, or subtract any piece that is cut away.
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A shape is a rectangle 2 m wide and 8 m tall with a triangle on top. The triangle has the same base as the width of the rectangle and a height of 5 m. Find the total area in square meters.
Answer: 21
A shape is a rectangle 4 cm wide and 8 cm tall with a triangle on top. The triangle has the same base as the width of the rectangle and a height of 3 cm. Find the total area in square centimeters.
Answer: 38
A shape is a rectangle 8 ft wide and 4 ft tall with a triangle on top. The triangle has the same base as the width of the rectangle and a height of 7 ft. Find the total area in square feet.
Answer: 60
Tip: Split the shape into rectangles and triangles. Find each area, then add them, or subtract any piece that is cut away.
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