A teenager whose eyes are five feet above graund level is looking into a mirror on the ground and can see the top of the building that is 30 feet away from the teenager.

The angle of elevation from the center of the mirror to the top of the building is 70º.

How tall is the building? How far away from the teenager's feet is the mirror?

215.92 dollars is the answer

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl

m∠a is 90°

m∠b is 40°