7.G.4

Front

What is the formula for the area of a circle?

Back

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is calculated using the formula: C = 2πr, where C is the circumference and r is the radius.

Front

If the radius of a circle is 6 cm, what is the circumference?

Back

Using the formula C = 2πr, the circumference is C = 2 × 3.14 × 6 = 37.68 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter of a circle is twice the radius: D = 2r.

Front

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

Back

Using the formula C = 2πr, the radius is r = C/(2π) = 31.4/(2 × 3.14) = 5 cm.

Front

What is the diameter of a circle with a radius of 12 cm?

Back

The diameter is D = 2r = 2 × 12 = 24 cm.

Front

What is the area of a circle with a radius of 10 cm?

Back

Using the formula A = πr^2, the area is A = 3.14 × 10^2 = 314 cm².

Front

What is the perimeter of a circle called?

Back

The perimeter of a circle is called the circumference.

Front

If the diameter of a circle is 20 cm, what is the radius?

Back

The radius is r = D/2 = 20/2 = 10 cm.