Area and Perimeter Formulas

What is the formula for the area of a trapezoid?

• Area = base1 × height

• Area = 1/2 × (base1 + base2) × height

• Area = (base1 + base2) × height

• Area = 1/2 × base1 × base2

How do you find the radius of a circle?

• Multiply the diameter by 2.

• Subtract the diameter from 10.

• Divide the diameter by 2.

• Add the diameter to 5.

What is the formula for the perimeter of a square?

• Perimeter = 4 × side

• Perimeter = 2 × (length + width)

• Perimeter = side × side

• Perimeter = 4 × (length + width)

What is the formula for the circumference of a circle?

• Circumference = π × diameter

• Circumference = 2 × π × radius

• Circumference = π × radius^2

• Circumference = 2 × radius

What is the formula for the area of a circle?

• Area = π × radius²

• Area = 2π × radius

• Area = π × diameter

• Area = radius² × height

What is the relationship between the diameter and radius of a circle?

• The diameter is twice the radius.

• The diameter is half the radius.

• The diameter is equal to the radius.

• The diameter is three times the radius.

What is the formula for the area of a triangle?

• Area = base × height

• Area = 1/2 × base × height

• Area = base + height

• Area = base × height²

How do you find the diameter of a circle?

• Multiply the radius by 2.

• Add the radius to the circumference.

• Square the radius and multiply by pi.

• Subtract the radius from the diameter.

What is the formula for the perimeter of a triangle?

• The perimeter is the sum of the lengths of all three sides.

• The perimeter is the length of the longest side multiplied by 3.

• The perimeter is the average of the lengths of the three sides.

• The perimeter is the sum of the lengths of the two longest sides.

When labeling area measurements, what is the unit?

• in

• cm

• ft

• squared (e.g., in², cm², ft²)