Question

11.
5.3 km
9 km

Explanation:

Step1: Recall area formula for parallelogram

Area = base × height

Step2: Substitute given values

Base = $9$ km, Height = $5.3$ km
Area = $9 \times 5.3$

Step3: Calculate the product

$9 \times 5.3 = 47.7$

Answer:

$47.7$ square kilometers