Geo CH 1.7 Area and Perimeter, and Circles

Front

What is the formula for the area of a rectangle?

Back

Area = length × width

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width)

Front

What is the formula for the area of a circle?

Back

Area = π(r^2), where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or πd, where d is the diameter.

Front

If the diameter of a circle is 18 inches, what is the radius?

Back

Radius = diameter / 2 = 9 inches.

Front

How do you find the area of a shaded region between a rectangle and a circle?

Back

Area of shaded region = Area of rectangle - Area of circle.

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Front

If a circle has a radius of 5 inches, what is its area?

Back

Area = π(5^2) = 25π ≈ 78.54 square inches.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

How do you convert diameter to radius?

Back

Radius = diameter / 2.