Question

please someone tell me the answer of this question.

Answer 1

side × side = b × h
40 × 40 = b × 20

40 × 40
------------ = b
20

b = 80m

Answer 2

Solution:

Given: Area of parallelogram (of height 20m) = Area of square(of side 40m)
                                                         $bh =a^2$
                                                         $20b=(40)^2$
                                                         $20b=1600$
                                                         $b=80m$