Answer: the length of the base is 15 kilometers.
Explanation:
formula : Area of parrallelogram = Length of base x height
Given: Area of parallelogram = 300 square kilometers
height = 20 kilometers
Substituting values in the formula , we get
300 = Length of base x 20
Length of base =
![(300)/(20)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ngx5l5kjd35ls22ikvgr8zywe2txlozat1.png)
= 15 kilometers
Hence, the length of the base is 15 kilometers.