March, 2012
1.
a)
Math 421A
Assignment #4
Term #1
Sine Ratio and Cosine Ratio
Find sin B and cos B for the following triangles: (4)
b)
4.8
3
4
5.2
1.4
5
2.
a)
Find the measure of each indicated angle to the nearest degree in the following: (6)
b)
3.
A firefighter rests a 15.6 m ladder against a building. The bottom of the ladder is 8.5 m from the base of the
building. What angle, to the nearest degree, does the ladder make with the ground? Include a sketch with your
answer. (6)
4. Find the length of the indicated side in the following to the nearest tenth: (7)
a)
b)
5.
Find the length of the hypotenuse in the following to the nearest tenth of a centimeter:
a)
b)
6.
A straight slide on a playground makes an angle of 28o with the ground. The slide covers a horizontal distance of
4.5 m. How long is the slide to the nearest tenth of a metre? Include a sketch with your answer. (6)
March, 2012
1. a) sin B = _____
2.
a)
Math 421A
Assignment #4
Term #1
Sine Ratio and Cosine Ratio
Answer Sheet
cos B = ______
b) sin B = _____
b)
3.
4.
a)
b)
5.
a)
b)
Name: __________________
cos B = _____
6.