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A glass pane 60 cm by 40 cm has a wooden frame 4 cm wide all around it. Find the area of the wood.

Class 7Area of Paths and BordersPerimeter and Area

A $3264 cm^{2}$
B $800 cm^{2}$
C $736 cm^{2}$
D $864 cm^{2}$

Step-by-Step Solution

Outer:

68 \times 48 = 3264 cm^{2}

. Glass:

2400 cm^{2}

. Wood

= 3264 - 2400 = 864 cm^{2} . (800 cm^{2} = 2 \times (60 + 40) \times 4

misses the corners.)

Answer: D)

864 cm^{2}

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