Question

what is the area of the triangle? square kilometers

Explanation:

Step1: Recall triangle - area formula

The formula for the area of a triangle is $A=\frac{1}{2}\times base\times height$.

Step2: Identify base and height

From the figure, the base of the triangle is $6$ km and the height is $7$ km.

Step3: Calculate the area

Substitute the values into the formula: $A = \frac{1}{2}\times6\times7$. First, $6\times7 = 42$, then $\frac{1}{2}\times42=21$ square kilometers.

Answer:

21