Question

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

Answer 1

Answer:

Let the length of the unknown side be x. ATP:x+5+x+7+x=213x+12=21=3x=9=x=9/3=3Lengths are:-x,x+5,x+7=3,3+5,3+7=3,8,10cmHope it helps mate

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

a+5+a+7+a=21

3a+5+7=21

3a+12=21

3a=21-12

3a=9

a=3

one side=3cm

another side =5+3=8cm

one more side =7+3=10cm

10+8+3=21cm