Awooden plank is leaning against a wall.
the bottom of the plank is 4 feet from the wall.
a) using the sine ratio, find ac, the approximate length of the plank.
round to the nearest tenth of a foot. (10 points)
b) using the tangent ratio, find bc, the height off the ground where the plank touches the wall.
round to the nearest tenth of a foot. (10 points)