Area of triangles
To calculate the area of a The simplest two-dimensional shape is the triangle, a three-sided shape with three angles., draw a second triangle to form a rectangle.
Example
The area of the rectangle is 8 cm2.
Two triangles make the rectangle. The area of one triangle is half the area of the rectangle.
\(8 \div 2 = 4~\text{cm}^2\)
The area of a triangle can also be calculated using the formula:
\(\text{area of a triangle} = \frac{1}{2} \text{base} \times \text{height}\)
or
\(\text{area of a triangle} = \frac{\text{base} \times \text{height}}{2}\)
In this case:
\(\frac{2 \times 4}{2} = 4~\text{cm}^2\)