Whole Circles
The diameter of a circle is 1 meter. What is the circle's area? (Round to the nearest hundredth)
0.79 meters
The radius of a semicircle is 4 feet. What is the semicircle's area? (Round to the nearest hundredth)
25.14
The radius of a quarter circle is 9 kilometers. What is the quarter circle's area? (Round to the nearest hundredth)
63.62 kilometers
What are the formulas for circumference and area for whole circles?
Area: A= πr2
Circumference: C= πd
The radius of a circle is 4.5 inches. What is the circle's circumference? (Round to the nearest hundredth)
28.27 inches
The diameter of a semicircle is 7.19 centimeters. What is the semicircle's circumference? (Round to the nearest hundredth)
18.49 centimeters
The quarter circle's diameter is 12.5 yards. What is the quarter circle's circumference? (Round to the nearest hundredths)
22.32 yards
What are the formulas for circumference and area for a semicircle?
A: A=1/2πr2
C: C=1/2πd + d
The diameter of a circle is 6.7 feet. What is the circle's area? (Round to the nearest hundredth)
35.26 feet
The radius of a semicircle is 24.78 millimeters. What is the semicircle's area? (Round to the nearest hundredth)
1929.09 millimeters
The radius of a quarter circle is 34.56 meters. What is the quarter circle's area? (Round to the nearest hundredth)
938.07 meters
What are the formulas for circumference and area of a quarter circle?
A: A= 1/4πr2
C: C= 1/4πd + d
The area of a circle is 154.73 miles. What is the circle's circumference? (Round to the nearest hundredth)
44.11 miles
The area of a semicircle is 4572.69 meters. What is the semicircle's cirfumference? (Round to the nearest hundredth)
277.41 meters
The radius of a quarter circle is 59.73 inches. What is its circumference? (Round to the nearest hundredth)
2133.28 inches.
How do you find the area of a whole circle using the circumference? Explain.
You divide the circumference by π getting you the diameter. Then you divide the diameter by 2, to get the radius. After that to find the area you do πr2.
The circumference of a circle is 593.28 kilometers. What is the circle's area? (Round to the nearest hundredth)
28009.77 or around that
A semicircle has a circumference of 25 yards. What is the semicircle's radius? (Round to the nearest hundredth)
3.98 yards
The radius of a quarter circle is 46.71 millimeters. What is its area AND circumference? (Round to the nearest hundredth)
Area: 1713.6 millimeters
Circumference: 166.79 millimeters
How do you find the circumference of a whole circle using the area? Explain.
You divide the area by π and then you find the square root of that and you get the radius. Then, you multiply the radius by 2 and then you do diameter times π to get the circumference.