Question

Find the perimeter of the rectangle whose length is 40 cm and a diagonal is 41 cm.

Answer 1

Diagonal²=lenght²+base²

41²=40²+base²
1681-1600=base²
81=base²
9=base

Perimeter =2(l+b) =2(40+9)=2*49=98cm

Answer 2

Step-by-step Answer:

Diagonal²=lenght²+base²

41²=40²+base²

1681-1600=base²

81=base²

9=base

Perimeter =2(l+b) =2(40+9)=2*49=98cm