Area and Perimeter Formulas

If I wanted to place a border around my pool, I would need to find:

• area

• perimeter

Which of the following formulas is used to find the area of a triangle?

• A = πr²

• A = l⋅w

• A = b⋅h/2

• A = 2πr

Which of the following formulas is used to find the area of a circle?

• A = πr²

• A = l⋅w

• A = b⋅h/2

• A = 2πr

Which of the following formulas is used to find the area of a rectangle?

• A = πr²

• A = l⋅w

• A = b⋅h/2

• A = 2πr

Find the area of the following triangle:

• 12 units²

• 6 units²

• 20 units²

• 12 units²

Find the area of the following circle:

• 4π ft²

• 16π ft²

• 2π ft²

• 8π ft²

Find the area of a square with a side length of 5 ft.

• 5 ft²

• 10 ft²

• 15 ft²

• 25 ft²

Find the area of the following circle:

• 9 in²

• 12 in²

• 36 in²

• 6 in²

Find the perimeter of the following triangle:

• 12 units

• 6 units

• 20 units

• 12 units

Find the circumference of the following circle:

• 4π ft

• 16π ft

• 2π ft

• 8π ft