CHAPTER 3

Question 0

SOHCAHTOA

Answer 0

sin = o/h
cos = a/h
tan = o/a

Question 1

Finding the hypotenuse?

Answer 1

c^2 = 2^2 + 1^2
= 5
= |5
= 2.24 (2dp)

Question 2

bearings?

Answer 2

1st quarter = 90
2nd quarter = 180
3rd quarter = 270
4th quarter = 360

Question 3

Finding side lengths with sin/cos/tan

Answer 3

eg) cos22 = x/7
x = 7cos22
x = 6.49 (2dp)

OR

tan36 = 5/x
x = 5/ tan36
x = 6.88 (2dp)

Question 4

Finding Angles with sin/cos/tan

Answer 4

use sin/cos/tan^-1
eg)
sinø = 6/7.5
= 53.13

Question 5

elevation and depression

Answer 5

/ = depression
\ = elevation

Question 6

shorter sides with theorem

Answer 6

a^2 + 5^2 = 7^2
a^2 = 7^2 - 5^2
a = |24