Area & Circumference of Circles

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r, where r is the radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 3 m, what is its area?

Back

Area = π × (3 m)² = 28.27 m².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 4 cm, what is its circumference?

Back

Circumference = 2 × π × 4 cm = 25.13 cm.

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you convert radius to diameter?

Back

Diameter = 2 × radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a diameter of 10 m?

Back

Area = π × (5 m)² = 78.54 m².

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 8 in?

Back

Circumference = π × 8 in = 25.13 in.

Tags

CCSS.7.G.B.4

Front

If the area of a circle is 50.27 cm², what is the radius?

Back

Radius = √(Area/π) = √(50.27/3.14) ≈ 4 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and circumference?

Back

Circumference is directly proportional to the radius.

Tags

CCSS.7.G.B.4