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 cm and 21 cm) can be used as the base and height.

Step2: Apply the area formula for a triangle

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

Answer:

\(210\space cm^{2}\)