Geometry B Unit 2

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Front

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

Back

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

Front

What is the total number of degrees in a circle?

Back

360 degrees.

Front

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

Back

Circumference = π × 12 cm ≈ 37.68 cm.

Front

What is the relationship between the angle of an arc and the angle at the center of the circle?

Back

The angle at the center (∠AOC) is equal to the angle of the arc (arc ABC) when measured in degrees.

Front

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

Back

Area = π × radius².

Front

If the radius of a circle is 24 feet, what is the circumference?

Back

Circumference = 2 × π × 24 feet ≈ 150.8 feet.

Front

What is a minor arc in a circle?

Back

A minor arc is an arc that is smaller than a semicircle (less than 180 degrees).

Front

How do you find the length of a minor arc given the radius and the angle?

Back

Length of minor arc = (θ/360) × 2πr, where θ is the angle in degrees and r is the radius.