Question

Which is the measure of AB
A. 10ft
B. 15ft
C. 20ft
D. 100ft

Answer 1

C

Explanation:

Since ΔABC is right use the sine ratio to find AB

sin30° =
`(opposite)/(hypotenuse)` =
`(AC)/(AB)`, hence

sin30° =
`(10)/(AB)` ( cross- multiply )

AB × sin30° = 10 ( divide both sides by sin30° )

AB =
`(10)/(sin30)` = 20 ft → C