Question

find the area of the triangle below.
be sure to include the correct unit in your answer.

Explanation:

Step1: Identify the base and height

This is a right - angled triangle. The two legs (20 ft and 21 ft) can be considered as the base and height.

Step2: Use the area formula for a triangle

The area formula for a triangle is \(A=\frac{1}{2}\times base\times height\). Substitute \(base = 20\) ft and \(height=21\) ft into the formula: \(A=\frac{1}{2}\times20\times21\).
First, calculate \(20\times21 = 420\). Then, \(\frac{1}{2}\times420=210\).

Answer:

\(210\) square feet