Question

what is the area of the shaded region? write your answer as a whole number or a decimal rounded to the nearest hundredth. square kilometers

Explanation:

Step1: Calculate area of large triangle

The area formula for a triangle is $A = \frac{1}{2}bh$. For the large triangle with base $b = 18$ km and height $h=19$ km, $A_{1}=\frac{1}{2}\times18\times19 = 171$ square - km.

Step2: Calculate area of small triangle

For the small triangle with base $b = 11$ km and height $h = 12$ km, $A_{2}=\frac{1}{2}\times11\times12=66$ square - km.

Step3: Calculate area of shaded region

The area of the shaded region $A = A_{1}-A_{2}$. So $A=171 - 66=105$ square - km.

Answer:

105