Area of polygons

Front

What is the formula for the area of a rectangle?

Back

A = lw (length × width)

Front

What is the formula for the area of a square?

Back

A = s² (side × side)

Front

What is the formula for the area of a parallelogram?

Back

A = bh (base × height)

Front

What is the formula for the area of a circle?

Back

A = πr² (pi times radius squared)

Front

What is the formula for the area of a triangle?

Back

A = 1/2(bh) (half of base times height)

Front

What does 'perimeter' mean?

Back

The distance around a shape.

Front

What is the formula for the area of a trapezoid?

Back

A = 1/2(h)(b1 + b2) (half of height times the sum of the bases)

Front

How do you find the radius of a circle?

Back

Divide the diameter by 2.

Front

How do you find the diameter of a circle?

Back

Multiply the radius by 2.

Front

What is the difference between area and perimeter?

Back

Area measures the space inside a shape; perimeter measures the distance around a shape.