Roof tiles

The roof has a trapezoidal shape with bases of 15 m and 10 m, and the height of the roof is 4 meters. How many tiles will need if on a one-meter square should be used eight tiles?

Correct answer:

n =  400

Step-by-step explanation:

a=15 m c=10 m h=4 m S1=(a+c)/2 h=(15+10)/2 4=50 m2 n=S1 8=50 8=400

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