A wooden 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)