Question

What is the length of the part BC of the bridge? Can someone explain how to do this. I tried it and got it wrong on a review test. 1600 by cos 30 meters

1600 cos 30° meters

1600 sin 30° meters

1600 by sin 30 meters

Answer 1

BC is the adjacent side

you're given the hypotenuse

so you must use the cosine function

Answer 2

cos(angle) = adj/hyp

cos(30) = x/1600

1600*cos(30) = x

x = 1600*cos(30)

Answer 3

You just answered my other question too is my issue knowing which is adj?

Answer 4

yeah it seems it

the adjacent side is the side where it touches the angle

the opposite side is the side that doesn't touch the angle (and it's like it is the furthest it can be from the angle)

Answer 5

so here's a good way to think about it

Answer 6

So the adj side changes between each triangle?

Answer 7

say x is the given angle

the leg adjacent to angle x is the side length C

the leg opposite to angle x is the side length B

Answer 8

yes it does, but the same idea still applies

Answer 9

Okay thank you

Answer 10

yw