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.

Tags

CCSS.HSG.C.A.2

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.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.HSG.GMD.A.1

Front

What is the definition of circumference?

Back

Circumference is the total distance around the circle.