#1
Formulas and Vocabulary
Formulas and Vocabulary
What does radius mean?
a. The distance from the center outwards.
b. The distance from one point on a circle through the center to another point on the circle.
c. The distance around the circle.
a. The distance from the center outwards.
What is the radius of a circle with a diameter of 50?
a. 100
b. 25
c. 75
d. 50
b. 25
What is the circumference of a circle when the radius is 11? Use 3.14 for pi. Round to the nearest hundredth.
A. 69.08
B. 34.56
C. 69.08
D. 34.54
A. 69.08
What is the area of a circle with a radius of 6? Use 3.14 for pi. Round to the nearest tenth.
A. 113.0
B. 18.8
C. 37.7
D. 56.5
A. 113.0
If Marco was measuring a pizza from the edge of the crust to the center, what part of a circle would he be measuring?
A. radius
B. diameter
C. circumference
D. area
A. radius
How is diameter different than Radius?
A diameter is....
a. The distance from the center outwards.
b. The distance from one point on a circle through the center to another point on the circle.
c. The distance around the circle.
b. The distance from one point on a circle through the center to another point on the circle.
What is the radius of a circle with a diameter of 12?
a. 12
b. 24
c. 6
d. 18
c. 6
What is the circumference of a circle when the diameter is 32? Use 3.14 for pi. Round to the nearest hundredth.
A. 100.53
B. 200.96
C. 100.48
D. 201.06
C. 100.48
What is the area of a circle with a radius of 17? Use 3.14 for pi. Round to the nearest tenth.
A. 106.8
B. 907.5
C. 226.9
D. 53.4
B. 907.5
If a pizza has a diameter of 18 inches, what is the pizza’s radius?
a. 18inches
b. 9 inches
c. 28inches
d. 4.5inches
b. 9 inches
What is the formula for circumference?
A. 𝐶=𝜋𝑟2
B. 𝐶=𝑙𝑤h
C. 𝐶=2𝜋𝑑
D. 𝐶=𝜋𝑑
D. 𝐶=𝜋𝑑
What is the diameter of a circle with a radius of 18?
a. 36
b. 18
c. 9
d. 27
a. 36
What is the circumference of a circle when the radius is 3? Use 3.14 for pi. Round to the nearest tenth.
A. 9.4
B. 18.8
C. 12.6
D. 6.3
B. 18.8
What is the area of a circle with a diameter of 100? Use 3.14 for pi.
A. 31400
B. 628
C. 7850
D. 785
C. 7850
Marco ordered a 16” wide pizza. How much area of pizza will he receive? Use 3.14 for pi. Round to the nearest tenth.
A. 803.8
B. 50.2
C. 201.0
D. 100.5
C. 201.0
What is circumference?
a. The point inside a circle that is the same distance from each point on the circle.
b. The distance from the center of the circle to a point on the circle’s edge.
c. The distance from one point on a circle through the center to another point on the circle.
d. The distance once around the edge of the circle.
d. The distance once around the edge of the circle.
What is the diameter of a circle with a radius of 4?
a. 4
b. 2
c. 6
d. 8
d. 8
If the area of the circle is 1962.5, what is the circumference? Use 3.14 for pi.
A. 25
B. 157
C. 12.5
D. 78.5
B. 157
If the area of the circle is 1962.5, what is the radius? Use 3.14 for pi.
A. 25
B. 50
C. 12.5
D. 75
A. 25
If a pie measure 7 inches from the edge of the crust to the center, what is the area of half of the pie?
Use 3.14 for pi. Round to the nearest hundredth.
A. 153.86
B. 43.96
C. 21.98
D. 76.93
D. 76.93
What is the Area for a Circle Formula?
a. 𝜋d
b. 2𝜋r
c. 𝜋r2
c. 𝜋r2
FREE POINTS!!!!
Free Points!!
If the area of the circle is 452.16, what is the circumference? Use 3.14 for pi.
A. 12
B. 37.68
C. 24
D. 75.36
D. 75.36
If the radius of the circle is 14, what is the area of half of the circle? Use 3.14 for pi. Round to nearest tenth.
A. 43.9
B. 307.7
C. 615.4
D. 53.4
B. 307.7
Kahlil baked 24 identical cookies. The width of a cookie is 3 inches. What is the area of all 24 cookies?
Use 3.14 for pi. Round to the nearest whole number.
A. 678
B. 28
C. 170
D. 226
C. 170