Roof 7

The roof has the shape of a regular quadrangular pyramid with a base edge of 12 m and a height of 4 m. How many percent is folds and waste if in construction was consumed 181.4m2 of plate?

Correct result:

p =  4.8152 %

Solution:

a=12 m h=4 m S=181.4 m2 h2=h2+(a/2)2=42+(12/2)2=2 13 m7.2111 m S1=h2 a/2=7.2111 12/2=12 13 m243.2666 m2 S2=4 S1=4 43.2666=48 13 m2173.0665 m2 p=100 (SS2)/S2=100 (181.4173.0665)/173.0665=4.8152%



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