Trigonometry (O'level Revision)

Use trigonometry to calculate the value of x.

• 16.4

• 17.5

• 8.78

The bearing B from A is  $100^{\degree}$  .  Calculate the bearing of A from B.

•  $080^{\degree}$  

•  $280^{\degree}$  

•  $260^{\degree}$  

The diagram shows a right-angled triangle.

Calculate the value of x.

• 9.35

• 4.6

• 7.55 cm

Use the cosine rule to find angle BAC.

• $82.8^{\degree}$

• $80.8^{\degree}$

• $79.2^{\degree}$

The bearing of C from A is 210°.

(i) Find the bearing of B from A.

(ii) Find the bearing of A from B.

• (i)127 (ii)307

• (i)150 (ii)300

• (i)121 (ii)270

The diagram shows triangle ABC.

Use the cosine rule to calculate BC.

• 14.5

• 13.9

• 12.9

The diagram shows triangle ABC.

Use the sine rule to calculate angle ACB

• 71.9

• 68.2

• 66.6

The diagram shows a right-angled triangle.

Calculate the value of x.

• 6.88

• 29.5

• 20.9

Calculate angle ABD.

• 52.9

• 53.9

• 25.9

Calculate angle CBD.

• 28.1

• 27.1

• 29.2