Take this Quiz: SAT Math — circles: radius, sectors, and the equation | Zestly

Question 1

A circle has a diameter of $10$. What is its circumference, in terms of $\pi$?

Accepted Answer

$10\pi$

Answer

$25\pi$

Answer

$5\pi$

Answer

$20\pi$

Question 2

A circle has a radius of $6$. What is its area, in terms of $\pi$?

Accepted Answer

$36\pi$

Answer

$144\pi$

Answer

$6\pi$

Answer

$12\pi$

Question 3

A circle has an area of $36\pi$. One of its sectors has a central angle of $120$ degrees. A sector is the same fraction of the whole circle as its central angle is of $360$ degrees. What is the area of this sector?

Accepted Answer

$12\pi$

Answer

$36\pi$

Answer

$120\pi$

Answer

$4\pi$

Question 4

A circle has a central angle of $60$ degrees. If the total circumference of the circle is $12\pi$, what is the length of the arc cut off by this central angle?

Answer

$3\pi$

Answer

$4\pi$

Answer

$1\pi$

Answer

$2\pi$

Question 5

A circle has an area of $49\pi$. What is its radius?

Answer

$49$

Answer

$7$

Answer

$14$

Answer

$24.5$

Question 6

A circle has a circumference of $18\pi$. What is its radius?

Answer

$9$

Answer

$18$

Answer

$36$

Answer

$4.5$