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 answer:

p =  4.8152 %

Step-by-step explanation:

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%

Did you find an error or inaccuracy? Feel free to write us. Thank you!

Tips for related online calculators
Our percentage calculator will help you quickly calculate various typical tasks with percentages.
The Pythagorean theorem is the base for the right triangle calculator.
See also our trigonometric triangle calculator.

You need to know the following knowledge to solve this word math problem:

We encourage you to watch this tutorial video on this math problem: video1   video2

Related math problems and questions: