Answer:
The length of longest side is 25 cm.
Step-by-step explanation:
Given that the perimeter of rectangle is, P = 2(l+w) where l represents length and w is width.
In this question let length be the shorter side and width be the longer side. Given that the length of this rectangle is 10 cm and the perimeter is 70 cm, so you have to substitute it into the formula :
[tex]p = 2(l + w)[/tex]
Let p = 70 cm,
Let l = 10 cm,
Let w = w cm,
[tex]70 = 2(10 + w)[/tex]
[tex]70 = 20 + 2w[/tex]
[tex]2w = 70 - 20[/tex]
[tex]2w = 50[/tex]
[tex]w = 25 \: \: \: cm[/tex]
