SOLUTION: The top of a board is resting against the side of a building, 80 cm above the ground. The base of the board is 20 cm away from the building. Which expression gives the measure of t

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Question 932015: The top of a board is resting against the side of a building, 80 cm above the ground. The base of the board is 20 cm away from the building. Which expression gives the measure of the acute angle that the board makes with the ground?
Question 5 options:

(A) sin -1(20/80)
(b) cos -1 (20/80)
(C) tan -1 (4)
(D) tan -1 (20/80)
these are multiple answers for the question can u kindly tell me the right answer
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
The top of a board is resting against the side of a building, 80 cm above the ground. The base of the board is 20 cm away from the building. Which expression gives the measure of the acute angle that the board makes with the ground?
Question 5 options:
let x=angle board makes with the ground
tanx=80/20=4
tan^-1=4(ans C)