Area and Perimeter 3rd Grade

Front

What is the perimeter of a shape?

Back

The perimeter is the total distance around the outside of a shape.

Front

How do you calculate the perimeter of a rectangle?

Back

Add the lengths of all four sides or use the formula: P = 2(length + width).

Front

What units are used to measure perimeter?

Back

Perimeter is measured in linear units such as inches, centimeters, or meters.

Front

What is area?

Back

Area is the amount of space inside a shape.

Front

How do you calculate the area of a rectangle?

Back

Multiply the length by the width: Area = length × width.

Front

What units are used to measure area?

Back

Area is measured in square units such as square inches (in²) or square centimeters (cm²).

Front

If a rectangle has a length of 5 cm and a width of 3 cm, what is its area?

Back

Area = 5 cm × 3 cm = 15 cm².

Front

If a rectangle has a perimeter of 20 cm, what could be its length and width?

Back

Possible dimensions could be length = 7 cm and width = 3 cm (P = 2(7 + 3) = 20 cm).

Front

What is the formula for the perimeter of a square?

Back

P = 4 × side length.

Front

If a square has a side length of 4 cm, what is its perimeter?

Back

P = 4 × 4 cm = 16 cm.