Circumference
What is the formula for circumference of a circle?
C=pi multiplied by d, or C=2 multiplied by pi multiplied by the radius
What is the formula for area of a circle?
The formula of area is pi multiplied by radius to the 2nd power (or pi times radius squared).
What is the length of an arc?
A portion of the circumference of a circle.
What is sector area (the area of a sector)?
The fraction of the area of an entire circle (like taking a slice of pie).
What is the circumference of this circle? If the diameter is 14 yd and pi is 3.14?
43.96 yd
What is the area of a circle, with the radius of 12 cm?
452.16 cm2
What is the diameter of the circle if the radius is 20m?
40m
How do you find the length of an arc?
Multiply the circumference of the circle times the degree of the arc divided by 360 degrees.
OR
Arc times Circumference divided by 360
How do you find the area of a sector?
Multiply the area of the circle times the degree of the arc divided by 360 degrees.
OR
Arc times Area divided by 360
What is circumference of a circle with a radius of 20 in? If the pi is 3.14?
125.6 in
What is the area of a circle, with the diameter of 30 cm?
706.5 cm2
What is the diameter if the radius is 2cm?
4cm
Find the length of an arc on a circle that is 232 degrees with the radius of 5mm.
*Round to the nearest HUNDREDTH.
20.25mm or 20.24mm
Find the sector area of a circle that is 232 degrees with the diameter of 10mm.
*Round to the nearest HUNDREDTH.
50.59mm2 or 50.61mm2
What is circumference (in terms of pi), if the area of a circle is 452.16 m2 ?
24pi m
What is the area of a circle (in terms of pi), if the circumference is 251.2 in?
1600pi in2
What is the diameter (rounded to the nearest tenth) if the area of a circle is 259m2 ?
18.2m
Find the length of an arc on a circle that is 73 degrees with the radius of 14.5 ft.
*Round to the nearest HUNDREDTH.
18.46 ft or 18.47 ft
Find the sector area of a circle that is 120 degrees with the radius of 14 ft.
*Round to the nearest HUNDREDTH.
205.15 ft2 or 205.25 ft2
What is the circumference (in terms of pi), if the area of a circle is 314 cm2 ?
20pi cm
What is the area of the circle (in terms of pi), if the circumference is 628 m? If the radius is 3.
10000pi m2
What is the diameter (rounded to the nearest tenth) if the circumference is 1,259yd?
401yd
Find the angle (to the nearest degree) of an arc whose length is 3.93 ft and circle has a 5 ft radius.
45 degrees
Find the angle (to the nearest degree) of an arc whose sector area is 78.5 ft2 and circle has a 10 ft radius.
90 degrees