Abuilder needs to add diagonal brace to a wall the wall is 16 ft wide by 12 ft what is the length of the brace

check the picture below.

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,