two parallel side of a trapezium are 60 amd 77 cm and other sides are 25 and 26 cm.find the area of the trapezium.
Draw a line DE parallel to AB and draw a perpendicular DF on CB.
It can be observed that ABED is a parallelogram.
BE = AD = 60 cm
ED = AB = 25 cm
EC = 77 − BE= 17 cm
For ΔDEC,
Semi-perimeter,
By Heron’s formula,
Area of triangle
Area of ΔDEC =
=cm2= 204 cm2
Area of ΔDEC =
Area of the trapezium ==