Circle Vocab

Front

What is the definition of a radius in a circle?

Back

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

Front

What is the definition of a diameter in a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) is calculated using the formula C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

The area (A) is calculated using the formula A = πr², where r is the radius.

Front

What is a tangent in relation to a circle?

Back

A tangent is a line that touches the circle at exactly one point.

Front

If a circle has a diameter of 10 ft, what is the radius?

Back

The radius is 5 ft.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is the area of a quarter-circle with a radius of 4 ft?

Back

The area is A = (1/4)π(4)² = 4π ft².

Front

What does π (pi) represent in circle calculations?

Back

π (pi) is a constant approximately equal to 3.14, used in formulas for circumference and area of circles.

Front

What is the definition of circumference?

Back

Circumference is the total distance around the circle.