Ratios and Pi
3 days ago
mathiscool
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• Question 1
120 seconds
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Q.

Which of the following formulas do we use to find the Circumference of a circle when given the radius?

$C\ =\ \pi d$

$C\ =\ 2\pi r$

$A\ =\ \pi r^2$

$C\ =\ \pi r^2$

• Question 2
120 seconds
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Q.

Which of these best describes  $\pi?$

The square root of the area of a circle.

The ratio of the radius of a circle to its diameter.

The radius of a circle times 3.14.

The ratio of the circumference of a circle to its diameter.

• Question 3
120 seconds
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Q.

Which of the following equations represents the relationship between the circumference, C, and the diameter, d, of any circle?

$C\ =\ \pi r$

$Cd\ =\pi$

$\pi=\ \frac{C}{r}$

$\pi=\frac{C}{d}$

• Question 4
60 seconds
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Q.

What number is pi?

1.41

3.14

2

5.14

• Question 5
60 seconds
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Q.

Which of these ratios is the closest approximation of pi?

$\frac{13}{4}$

$\frac{19}{6}$

$\frac{16}{5}$

$\frac{22}{7}$

• Question 6
60 seconds
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Q.

_______________ is the distance around a circle.

circumference

center

diameter

• Question 7
60 seconds
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Q.

_____________ is half of the diameter

circumference

center

diameter

• Question 8
60 seconds
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Q.

circumference

center

diameter

• Question 9
60 seconds
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Q.

If the radius of a circle is 12.5 meters, the diameter is _

6.25 meters

25 meters

125 meters

50 meters

• Question 10
60 seconds
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Q.

If the diameter of a circle is 50 yards, the radius is ______.