Respuesta :

Answer:

its an equilateral triangle and so one of the side is 6

so to find the answer you should multiply one side into 3

                                                                      =3 x side

                                                                       =6 x 3

                                                                       = 18

Step-by-step explanation:

mark as brainliest

thank me

a squared + b squared = c squared
6 squared is 36
so 36 + 36 = x
36 + 36 = 72
x = 72
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