Question

the perimeter of equalatral triangle whose side is (2x+3) unit is 21 units
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Answer 1

perimeter of equilateral triangle = 3a. step 2 - perimeter = 21 so 2x+3=21 then 2x=21-3 which is equal to 2x=18 and hence x= 18/2= 9

Answer 2

Answer:

Here is your answer..

Step-by-step explanation:

Perimeter of equilateral triangle = 3×side

Here, side = 2x+3

Perimeter of equilateral triangle = 21 units

Therefore,

3(2x+3) = 21 units

6x +9 = 21 units

Tranpose methdod-

6x = (21-9) units

6x = 12 units

x = 12/6 units or 2 units..

Therefore, x = 2..

Verify..

3(2×2+3) = 21 units

3(4+3) = 21 units

3×7 units = 21 units

21 units = 21 units..

Therefore, both are equal..

Hence, side = 7 units...

Hence,