Question

formula of sum of parallel sides of a trapezium​

Answer 1

The area of a trapezium is given by = 12 x (Sum of Parallel Sides) x (Distance Between them). Here, the measures of parallel sides are 10 cm and 20 cm. So, their sum = 10 cm + 20 cm = 30 cm. and given that height is 15 cm.

Answer 2

Answer:

area of trapezium :-

$\frac{1}{2} \times sum \: of \: parallel \: sides \times height$

hope it will help you