Circles Review

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

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 (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Tags

CCSS.7.G.B.4

Front

How do you find the length of an arc in a circle?

Back

Arc length = (θ/360) × 2πr, where θ is the central angle in degrees.

Tags

CCSS.HSG.C.B.5

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is the relationship between the central angle and the inscribed angle that subtends the same arc?

Back

The central angle is twice the measure of the inscribed angle.

Tags

CCSS.HSG.C.A.2

Front

What is the measure of a semicircle?

Back

A semicircle measures 180°.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

What is the formula for the area of a sector of a circle?

Back

Area of sector = (θ/360) × πr², where θ is the central angle in degrees.

Tags

CCSS.HSG.C.B.5

Front

If the radius of a circle is 5 ft, what is the area?

Back

Area = π(5)² = 25π ft² ≈ 78.54 ft².

Tags

CCSS.7.G.B.4

Front

What is the measure of a full circle in degrees?

Back

A full circle measures 360°.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1