The figure below is made up of a rectangle WUVY and a square WXYZ. The length of WZ is 8 cm. What is the area of the whole figure? Answer: ___ cm2\text{cm}^2

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Worked solution

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1. Calculate the area of the square $WXYZ$ and the triangle $WXY$.

Area of square WXYZ=8×8=64 cm2WXYZ = 8 \times 8 = 64 \text{ cm}^2
Area of triangle WXY=12×64=32 cm2WXY = \frac{1}{2} \times 64 = 32 \text{ cm}^2

2. Relate the area of triangle $WXY$ to the area of rectangle $WUVY$.

Triangle WXYWXY and rectangle WUVYWUVY share the same base WYWY.
Since XX lies on the line UVUV which is parallel to WYWY, the perpendicular height of triangle WXYWXY from XX to WYWY is equal to the width of the rectangle WUVYWUVY.
Therefore, Area of rectangle WUVY=2×Area of triangle WXY=2×32=64 cm2WUVY = 2 \times \text{Area of triangle } WXY = 2 \times 32 = 64 \text{ cm}^2.

3. Calculate the area of the whole figure.

The whole figure is made up of triangle WZYWZY and rectangle WUVYWUVY.
Area of triangle WZY=32 cm2WZY = 32 \text{ cm}^2
Total area = 32+64=96 cm232 + 64 = 96 \text{ cm}^2

Answer

9696

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