Question

two sides of triangle are 5 and 7 cm longer than the third side. if the perimeter is 21cm, find the length of each side.​

Answer 1

Answer:

Side 1 = 5cm

Side 2 = 7cm

Side 3 = 9cm

Step-by-step explanation:

Given;                                  To Find;

Side 1 = 5cm                        Side 3 = ?

Side 2 = 7cm

Perimeter = 21cm

Perimeter of a Triangle =  Side 1+ Side 2+ Side 3

21 = 5 + 7 + side 3

21 - 12 = side 3

9 c= side 3

Answer 2

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X+(x+7)+(x+5)=21

3x+12=21

3x=9

X=3

First side =3

Second side(3+5)=8

Third side(3+7)=10