Awooden plank is leaning against an outside wall of a building. the bottom of the plank is 3 ft from the wall. find each of the following values, and show all your work. (a) find the approximate length of the plank. round to the nearest tenth of a foot. (b) find the height above the ground where the plank touches the wall. round to the nearest tenth of a foot.

(A) Find the approximate length of the plank. Round to the nearest tenth of a foot.
Given that the distance of the ground is 3ft.
In order to get the length of the plank,
we can use the this one.

cos 49 = ground / plank
cos 49 = 3 / plank
plank = cos 49 / 3
plank = 0.10 ft

(b) Find the height above the ground where the plank touches the wall. Round to the nearest tenth of a foot.

The remaining angle is equal to
angle = 180 - (90+49)
angle = 41

Finding the height.
tan 41 = height / ground
tan 41 = height / 3
height = tan 41 / 3
height = 0.05 ft.

(A) 0.10 feet
(B) 0.05 feet