Trigonometry Revision

B AC 30 º hypotenuse adjacent opposite

B AC 30 º hypotenuse adjacent opposite Hypotenuse is opposite the right angle and is the longest side. Adjacent is next to the angle Opposite is across from the angle.

D 57 º E F adjacent hypotenuse opposite

10 A x Has hypotenuse but is Not cosy

10 A x

2 x A No hypotenuse so it must be tan

2 x A

20 x A Has hypotenuse and is cosy

20 x A

x A 33 No hypotenuse must be tan

x A 33

9 m X 6 m

9 m X 6 m Calculator:

9 m X 6 m Calculator:

7 cm 3 cm Y

7 cm 3 cm Y

7 m Z 5 m

7 m Z 5 m

68 º x 7 m

68 º x 7 m

15 m y 73 º

15 m y 73 º

9 m z 34 º

9 m z 34 º

40 º x 6 m

40 º x 6 m

x 23 º

6 m x 23 º

30 º x 5 m

30 º x 5 m

25 cm 22 cm x

25 cm 22 cm x

10 m 1.2 m x

10 m 1.2 m x

A B CD 40° 2 m 1.2 m Find length BC

A B CD 40° 2 m 1.2 m x First find x

A B CD 40° 2 m 1.2 m x Use Pythagoras’

A B CD 40° 2 m 1.2 m 1.6

A B CD 40° 2 m 1.2 m x