Question

Find the area of the quadrilateral whose sides measure 9 cm, 40 cm, 28 cm and 15 cm and in which the angle between the first two sides is a right angle.

Answer 1

Now, area of triangle ABC = $\frac{1}{2}\times 40\times 9$
area of ADC
Apply heron's formula
Take the sum of area of triangle ABC and triangle ADC