Circumference and Area of Circles

What is the formula for the area of a circle?

• Area = 2πr

• Area = πr²

• Area = πd

• Area = r²

Tags

CCSS.7.G.B.4

If the radius of a circle is 7 cm, what is its area?

• 100 cm²

• 154 cm²

• 200 cm²

• 150 cm²

Tags

CCSS.7.G.B.4

What is the formula for the circumference of a circle?

• Circumference = 2πr

• Circumference = πr^2

• Circumference = 4πr

• Circumference = πd

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a radius of 12.5 mm?

• 62.8 mm

• 78.5 mm

• 100.5 mm

• 50.3 mm

Tags

CCSS.7.G.B.4

How do you find the radius if you know the circumference?

• Radius = Circumference / (2π)

• Radius = Circumference / π

• Radius = 2 * Circumference

• Radius = Circumference / 4

Tags

CCSS.7.G.B.4

What does the term 'area' refer to in the context of a circle?

• The circumference of the circle.

• The amount of space inside the circle.

• The diameter of the circle.

• The radius of the circle.

If the area of a circle is 28.26 cm², what is the radius?

• 2 cm

• 3 cm

• 4 cm

• 5 cm

Tags

CCSS.7.G.B.4

If the diameter of a circle is 10 m, what is its circumference?

• 25.12 m

• 31.42 m

• 20.00 m

• 15.70 m

Tags

CCSS.7.G.B.4

How do you find the diameter if you know the radius?

• Diameter = Radius × 2

• Diameter = Radius + 2

• Diameter = Radius - 2

• Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

What is π (pi) approximately equal to?

• 2.71

• 3.14

• 3.33

• 4.00

Tags

CCSS.HSG.GMD.A.1