Geometry Flashcard Perimeter, Circumference, Area

Front

What does perimeter mean?

Back

The distance around the shape.

Front

If a rectangle has a length of 15 feet and a width of 21 feet, what is its perimeter?

Back

72 feet.

Front

Find the perimeter of a rectangle with a length of 19 cm and a width of 0 cm.

Back

38 cm.

Front

What is the area of a rectangle with side lengths 5 inches by 8 inches?

Back

40 square inches.

Front

Farmer Bob wants to build a fence around a rectangular area that is 40 feet long and 20 feet wide. How many feet of fence does he need?

Back

120 feet.

Front

What is the formula for calculating the perimeter of a rectangle?

Back

Perimeter = 2(length + width).

Front

What is the formula for calculating the area of a rectangle?

Back

Area = length × width.

Front

What does circumference mean?

Back

The distance around a circle.

Front

If the radius of a circle is 7 inches, what is its circumference?

Back

Approximately 43.98 inches (C = 2πr).

Front

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

Back

Area = πr².