polygons

What is the formula for the area of a square?

The formula for the area of a square is A = s^2, where s is the length of one side.

What are the formulas for the area and perimeter of a rectangle?

The formula for the area of a rectangle is A = l \times w, where l is the length and w is the width.
The formula for the perimeter of a rectangle is P = 2(l + w), where l is the length and w is the width.

What are the formulas for the area and circumference of a circle?

The formula for the area of a circle is A = \pi r^2, where r is the radius.
The formula for the circumference of a circle is C = 2 \pi r or C = \pi d, where r is the radius and d is the diameter.

What is the formula for the area of a triangle?

The formula for the area of a triangle is A = \frac{1}{2}bh, where b is the length of the base and h is the height.

What is the formula for the area of a parallelogram?

The formula for the area of a parallelogram is A = bh, where b is the length of the base and h is the height perpendicular to the base.