Perimeter/Area of Circles and SemiCircles

Front

What is the formula to calculate the radius from the diameter?

Back

Radius = Diameter ÷ 2

Tags

CCSS.7.G.B.4

Front

What does area mean in geometry?

Back

The amount of space inside a shape.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × Radius.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 inches, what is the circumference?

Back

31.42 inches.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

Area = π × Radius².

Tags

CCSS.7.G.B.4

Front

If the diameter of a semicircle is 8 cm, what is its radius?

Back

4 cm.

Tags

CCSS.7.G.B.4

Front

What is the area of a semicircle with a diameter of 8 cm?

Back

25.12 cm².

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you calculate the area of a circle with a radius of 10 cm?

Back

Area = π × (10 cm)² = 314 cm².

Tags

CCSS.7.G.B.4

Front

What is the difference between circumference and area?

Back

Circumference is the distance around a shape; area is the space inside.