CIRCUMFERENCE & AREA OF A CIRCLE

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where r is the radius and d is the diameter.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

The diameter is the distance from one edge of the circle to the opposite edge, passing through the center.

Tags

CCSS.HSG.C.A.2

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

Diameter = 2 * radius = 2 * 5 cm = 10 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

How do you find the area of a semicircle?

Back

Area of semicircle = (1/2) * πr².

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 31.4 meters, what is the radius?

Back

Radius = Circumference / (2π) = 31.4 / (2π) ≈ 5 meters.

Tags

CCSS.7.G.B.4

Front

What is π (pi)?

Back

π is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Tags

CCSS.HSG.GMD.A.1

Front

If the radius of a circle is 9 meters, what is the area?

Back

Area = πr² = π(9)² ≈ 254.34 square meters.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

Circumference = πd = π(10) ≈ 31.4 cm.

Tags

CCSS.7.G.B.4