3Exp Chapter 7

Find the value of a.

• 13.4

• 12.9

• 13.1

• 12.8

Find the value of c.

• 24.2

• 31.0

• 15.2

• 19.4

Find angle A?

• 50.0 $\degree$

• 60.6 $\degree$

• 77.8 $\degree$

• 74.5 $\degree$

Find angle θ.

• 28.0 $\degree$

• 29.2 $\degree$

• 26.8 $\degree$

• 45.0 $\degree$

Amanda and Jamie are standing 25 feet apart and they spot a bird in the sky between them. The angle of elevation from Amanda to the bird is 55 $\degree$  , and from Jamie to the bird is 63 $\degree$  . How far away is the bird from Amanda?

• 20.9 feet

• 23.2 feet

• 22.2 feet

• 25.2 feet

What rule should you use?

• Sine
• Cosine

Which of the following formulas is the Cosine rule?

• $c^2=a^2+b^2-4ac+\cos A$

• $c^2=a^2-b^2-2ab\cos C$

• $c^2=a^2+b^2-2ab\cos C$

• $\frac{\cos A}{A}=\frac{\cos B}{B}=\frac{\cos C}{C}$

Find the unknown side length, c.

• 6.52 units

• 6.38 units

• 6.91 units

• 6.67 units

In the ABC we have AB = 5 cm, AC = 6 cm,  $\angle A$ = 60°. Find the length of the side BC.

• √31 cm

• √29 cm

• √25 cm

• √15 cm

We can use SOH CAH TOA for...

• any triangles

• Non-right-angled triangles only

• Right-angled triangles only

• any shapes