The area of a rhombus is 120 cm^2. If one diagonal measures 20 cm, how much is its side measure

First Step:
Measure of the 2nd diagonal to be found out.
Formula to be used:
A = 1/2 * d1 * d2

Next Step:
Measure of a side of rhombus to be found out.
Formula to be used:
4*s^2 = d1^2 + d2^2

120 = 1/2 * 20 * d2
d2 = 240/20
= 12

s^2
= (400 + 144)/4
= 100 + 36

s
= Sqrt(136)
= 11.66

Hello,

The forumla for area of a thombus is
(diagonal 1) * (diagonal 2) * (1/2)
A= area
D1= Diagonal 1 = 20
D2= Diagonal 2 = x

Equation:
120=20*x*.5
240=20*x
x=12