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April 21, 2014

April 21, 2014

Posted by **Rin** on Thursday, January 27, 2011 at 9:44am.

- MATH -
**helper**, Thursday, January 27, 2011 at 11:04amIf I am picturing this correctly, a right triangle is formed, with the hypotenuse c = 75 cm.

Since the top of the wall is 5.4 m above ground, 5.4 - side a = height above ground to the roof edge.

Angle A = 180 - (23 + 90) = 82 degrees

sin 82 = op/hyp = a/c = a/75

0.9903 = a/75

a = 74 cm

5.4 m /100 = 540 cm

540 cm - 74 cm = 466 cm

466 cm = height above ground to roof edge

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