Question

two adjacent sides of a parallelogram measure 15 cm and 20 cm while the diagonal opposite their common vertex measure 25 cm.find the area of he parallelogram.
kay
As 25^2=625 & 15^2+20^2=225+400=625 from Pythagoras theorem it's a right angle triangle therefore the parallelogram is a rectangle. So area= 15*20=300 cm^2