Arun
Last Activity: 6 Years ago
Dear student
As if we draw a diagonal, it bisect the parallelogram inntwo congruent triangles.
Hence sum of areas of two congruent triangles = area of parallelogram
2* (1/2) * side * 20 = 450
Side = 45/2
= 22.5 cm
Regards
Arun (askIITians forum expert)