Find the height of the trapezium in which parallel sides are 25 cm and 10 cm and non-parallel sides are 14 cm and 13 cm.

Draw AE||BC, through A.

Draw AF⊥CD

For ∆ ADE,

s = 21 cm,

Area of ∆

ADE=

=

= 84 cm2

1/2 ×height = 84 cm2

Height = = 11.2 cm