Parts of a Circle and Circumference

What is the name for the part of the circle labeled by the letter A? (It is the distance from the center of the circle to the "edge").

• radius

• diameter

• circumference

• center

What is the name for the part of the circle labeled by the letter C? (It is the line that divides the circle in half)

• radius

• diameter

• circumference

• center

What is the name for the part of the circle labeled by the letter B? (It is the midpoint of the circle)

• radius

• diameter

• circumference

• center

What is the name for the part of the circle labeled by the letter D? (It is the distance around the circle)

• radius

• diameter

• circumference

• center

What is the formula to find the length of the diameter of a circle given the radius?

• $d=\frac{1}{2}r$

• $d=2r$

• $d=\frac{C}{\pi}$

• $d=\pi r^2$

Which of the following is the formula to find the circumference of a circle?

• $C=\frac{d}{\pi}$

• $C=\pi r^2$

• $C=\pi\cdot d$

• $C=\frac{1}{2}d$

Which of the following is NOT an approximate value for pi ( $\pi$ )? 

•  $3.14$  

•  $\frac{22}{7}$  

•  $3.29$  

Find the circumference of the circle shown. Use 3.14 for $\pi$  

• 69.08 ft.

• 34.54 ft.

• 379.94 ft.

• 187.53 ft.

Find the circumference of the circle shown. Use 3.14 for $\pi$

• 12.56 km.

• 25.12 km.

• 6.28 km.

• 4 km.

Find the circumference of the circle shown. Use 3.14 for $\pi$

• 43.96 yd

• 21.98 yd

• 153.86 yd

• 14 yd