Question

find the area of the given quadrilateral​

Answer 1

let, mid point is O

In triangle DOC

By Pythagoras theorem

OD^2+20^2 = 30^2

OD^2+400 = 900

OD^2 = 900-400

= 500

OD =√500

OD= 22.36

Area of∆DOC = 1/2×base×height

=1/2×20×22.36

= 223.6

area of four triangles=4×223.6

=89.44