3.7 Radian measure Quiz

1. $\frac\pi3$ radians is equal to...

• A. $30^\circ$
• B. $45^\circ$
• C. $60^\circ$
• D. $90^\circ$

2. A sector has radius 5 cm and angle 0.8 radians. Find its arc length.

• A. $2$ cm
• B. $4$ cm
• C. $8$ cm
• D. $20$ cm

3. A sector has radius 4 cm and angle $\frac\pi2$. Find its area.

• A. $2\pi$ cm$^2$
• B. $8\pi$ cm$^2$
• C. $16\pi$ cm$^2$
• D. $4\pi$ cm$^2$

4. Express $135^\circ$ in radians.

• A. $\frac{3\pi}{4}$
• B. $\frac{4\pi}{3}$
• C. $\frac{3\pi}{2}$
• D. $135\pi$

5. What is the perimeter of a sector with radius $r$ and angle $\theta$ radians?

• A. $r\theta$
• B. $2r+r\theta$
• C. $2r+\frac12r^2\theta$
• D. $r\theta+r$