# Roof tiles

The roof has a trapezoidal shape with bases of 15 m and 10 m, height of roof is 4 meters. How many tiles will need if on 1 m2 should be used 8 tiles?

Correct result:

n =  400

#### Solution:

$a=15 \ \text{m} \ \\ c=10 \ \text{m} \ \\ h=4 \ \text{m} \ \\ S_{1}=(a+c)/2 \cdot \ h=(15+10)/2 \cdot \ 4=50 \ \text{m}^2 \ \\ n=S_{1} \cdot \ 8=50 \cdot \ 8=400$

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