Vocabulary
Name a shape that has no edges.
Circle
What is the circumference of a circle if:
the radius = 7 yds?
43.96 or 14π yds
What is the circumference of a circle if:
the Diameter = 4 in
12.56 or 4π in
What is the area of a circle if:
the Radius = 6 in
36π or 113.04 in2
11
Name the line in a circle that cuts it in half.
Diameter
What is the circumference of a circle if:
the radius = 9 yds?
56.52 or 18π yds
What is the circumference of a circle if:
the Diameter = 10 in
31.40 or 10π in
What is the area of a circle if:
the Radius = 3 ft
9π or 28.26 ft2
What is the diameter of a circle with a radius of 7.5?
15
What do you call half of the Diameter?
Radius
What is the circumference of a circle if:
the radius = 8.4 yds?
52.75 or 16.8π yds
What is the area of a circle if:
the Radius = 14 in
615.44 or 196π in2
What is the area of a circle if:
the Diameter = 12 feet?
36π or 113.04 ft2
What is bigger, radius or diameter?
diameter
The outside measurement of a circle.
Circumference
What is the circumference of a circle if:
the radius = 7.4 yds?
46.47 or 14.8π yds
What is the Area of a circle if:
the Diameter = 14 in
153.86 or 49π in2
What is the area of a circle if:
the diameter = 8 in
16π or 50.24 in2
How do you find the radius if you know the diameter?
Divide it by two or multiply by 1/2.
The measurement of the inside of a circle
Area
The circular fountain in front of the courthouse has a radius of 9.4 feet. What is the circumference of the fountain? Round to the nearest tenth.
What is 59 ft?
What is the circumference AND area of a circle if:
the Diameter = 10 in.
Circumference: 10pi or 31.4 in
Area: 25pi or 78.5 in2
What is the area of a circle if:
the diameter = 9 yd
20.25π or 63.56 yd2
The radius of a circle is (2x - 4), find the expression for the diameter.
4x - 8