Correct option is C
Given:
The length of the parallel sides of the trapezium are 12 cm and 18 cm.
The shortest distance between two parallel side is 20 cm.
Concept Used:
Area of a trapezium = × (Sum of the length of the parallel sides) × (Shortest distance or perpendicular distance between two parallel side)
Solution:
Area of the trapezium = × (12 + 18) × (20) = 15 × 20 = 300 sq. cm