Final Math 4 Review

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What is a minor arc in a circle?

Back

A minor arc is an arc that is smaller than a semicircle.

Front

What is the standard equation of a circle?

Back

(x - h)² + (y - k)² = r², where (h, k) is the center and r is the radius.

Front

If a circle has a diameter of 18 meters, what is its radius?

Back

Radius = Diameter / 2 = 18 / 2 = 9 meters.

Front

What is the area of a circle with a radius of 4?

Back

Area = π(4)² = 16π or about 50.24 m².

Front

What is the circumference of a circle with a radius of 4?

Back

Circumference = 2π(4) = 8π or about 25.12.

Front

How do you find the length of a minor arc?

Back

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

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.