# Windows

Calculate the area of masonry to build wall with dimensions of 9 m × 4 m with 4 windows of size 64 cm × 64 cm.

Correct result:

S =  34.4 m2

#### Solution:

$c = 64 \ cm = 0.64 \ m \ \\ S = 9 \cdot 4 - 4 \cdot 0.64 \cdot 0.64 = 34.4 \ \text{m}^2$

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