Finding Area and Circumference of a Circle

What is the center point of a circle called?

• Center

• Radius

• Diameter

• Circumference

What formula is used to calculate the circumference of a circle?

• A = 2πr

• C = πr^2

• C = 2πr

• A = πr^2

Tags

TEKS.MATH.7.9B

How do you find the area of a circle?

• Square the radius and multiply by π

• Multiply the diameter by π

• Divide the circumference by π

• Multiply the circumference by the radius

Tags

TEKS.MATH.7.9B

Why is it important to understand the formulas for circumference and area of a circle?

• To understand square shapes better

• It is not important

• Only for academic purposes

• To calculate the size of circular objects

Tags

TEKS.MATH.7.9B

If the radius of a circle is 8 meters, what is its circumference in terms of π?

• 16π meters

• 8π meters

• 32π meters

• 64π meters

Tags

TEKS.MATH.7.9B

What is the area of a circle with a radius of 8 meters, in square meters?

• 256π m²

• 201.1 m²

• 16π m²

• 64π m²

Tags

TEKS.MATH.7.9B

What is the radius of a circle if its diameter is 24 inches?

• 48 inches

• 12 inches

• 6 inches

• 24 inches

What is the approximate circumference of a circle with a radius of 12 inches?

• 24π inches

• 75.4 inches

• 36π inches

• 48π inches

Tags

TEKS.MATH.7.9B

How is the diameter of a circle related to its radius?

• It is four times the radius

• It is twice the radius

• It is half the radius

• It is equal to the radius

What is the approximate area of a circle with a diameter of 24 inches?

• 144π inches squared

• 72π inches squared

• 288π inches squared

• 452 inches squared

Tags

TEKS.MATH.7.9B