Table of Contents
1. Area of Square
The area of a square is the product of its length and width. The area of a square is always the same, no matter what the length and width are. The area of a square is A = l × w.
2. Area of Rectangle
The area of a rectangle is the product of the length and width of the rectangle.
3. Area of Triangle
ABC
The area of triangle ABC is
A = 1/2bh
A = 1/2 (9) (12)
A = 54
4. Area of Circle
The area of a circle is πr2, where r is the radius of the circle.
5. Sector Area Formula
The sector area formula calculates the area of a sector in a circle. The sector is the slice of the circle that is enclosed by the two radii and the arc that they create.
The sector area formula is:
A = πr2θ
6. Ellipse Area Formula
The ellipse area formula is pi*r*r, where r is the radius of the ellipse.
7. Trapezoid Area Formula
The area of a trapezoid is the sum of the bases multiplied by the height, divided by 2.
A = (b 1 + b 2 )h / 2
8. Area of Parallelogram Formula
The area of a parallelogram is the base multiplied by the height.
9. Area of Rhombus Formula
The area of a rhombus is given by the following formula:
A = d1 × d2 ÷ 2
10. Regular Polygon Area Formula
The area of a regular polygon is given by:
\begin{align*}
A &= \frac{1}{2} \mbox{perimeter} \times \mbox{angle} \\
A &= \frac{1}{2} \cdot P \cdot \alpha \\
A &= \frac{P}{2} \cdot \alpha^2 \end{align*}
where:
\mbox{perimeter} is the length of the polygon’s perimeter
\mbox{angle} is the measure of each interior angle of the polygon
\mbox{P} is the perimeter of the polygon
\alpha is the measure of each interior angle of the polygon
