Question

what is the area of the shaded region?
100 km
71 km
square kilometers
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Explanation:

Step1: Calculate area of outer rectangle

$\text{Area}_{\text{outer}} = 100 \times 71 = 7100$ km²

Step2: Calculate area of inner rectangle

$\text{Area}_{\text{inner}} = 51 \times 71 = 3621$ km²

Step3: Subtract inner from outer area

$\text{Area}_{\text{shaded}} = 7100 - 3621$

Answer:

3479 square kilometers