Question

A lamp post, CAB, bent at point A after a storm. The tip of the lamp post touched the ground at point C, as shown below.

http://oi48.tinypic.com/24b3nv6.jpg

What is the height, in feet, of the portion AB of the lamp post?

A)20/tan55
B)20 cos55
C)20 tan55
D)20/cos55

Answer 1

@terenzreignz

Answer 2

isnt this C?

Answer 3

Yes, it's C.

Answer 4

are you sure? @terenzreignz

Answer 5

SOHCAHTOA

Sine = Opposite / Hypotenuse
Cos = Adjacent / Hypotenuse
Tan = Opposite / Adjacent

So for angle BCA which is 55 degrees, you want the length of O and you know A = 20, so the length is best defined as O/A = O/20 = tan 55, so (tan 55)/20 = O.

Answer 6

Wait that can't be right...

Answer 7

so what would it be? @Rav

Answer 8

Right tan 55 * 20 = O, my bad.

Answer 9

was i right? @Rav

Answer 10

The answer is C.

Answer 11

ok thanx,can u help me with only one more @Rav