Unit 4 Day 3- CIRCUMFERENCE DAY 2 – TEKS 7.9(B)

Front

What is the formula for calculating the circumference of a circle?

Back

C = πd or C = 2πr

Front

If the circumference of a circle is 31.4 yards, what is the diameter?

Back

10 yards

Front

Define the radius of a circle.

Back

The radius is the distance from the center of the circle to any point on its edge.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 * Radius

Front

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

Back

r = C / (2π)

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

If a circle has a radius of 7 inches, what is its diameter?

Back

14 inches

Front

What is the formula to find the area of a circle?

Back

Area = πr²

Front

If the diameter of a circle is 12 cm, what is its circumference?

Back

C = πd = 12π cm.

Front

What is the formula for calculating the diameter of a circle from its circumference?

Back

Diameter = Circumference / π