Geometry Reteach Practice

Choose the correct ratio.

 Find sin(C)

Which Trig function do you use?

• Sine
• Cosine
• Tangent

Find the length of side w.

• 21.4 cm
• 18.0 cm
• 36.5 cm
• 43.6 cm

Solve for the missing angle

• 50
• 0.053
• 36.9
• 95

Find the value of y.

• 8
• 4
• 2√3
• 8√3

Find the value of y to the nearest tenth.

• 4.5
• 3.2
• 2.3
• 5

What is the length of x?

• 5
• 7
• 8
• 25

Answer explanation

Remember we need to use the Pythagorean theorem, 3 and 4 are our leg lengths. 3 squared plus 4 squared gives us 25. The square root of 25 is 5, so our hypotenuse length is 5.

Choose the correct values for x and y in the right triangle.

The radius of one circle is 9mm and the radius of a second circle is 21mm. What is the ratio of their circumferences in simplest form?

• 9:21

• 1:3

• 3:7

• 9:49