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(2x+5) + (3x-2) + (4x+6) = 36
9x +9 = 36
9x = 36 -9
9x = 27
x = 27/9
x = 3
sisi a = 2x+5 = 2.3+5 = 11 cm
sisi b = 3x-2 = 3.3 -2 = 7 cm
sisi c = 4x+6 = 4.3+6 = 18 cm
semoga membantu
sisi a = 2x+5
sisi b = 3x-2
sisi c = 4x+6
K = 36
maka :
K = sisi (a+b+c)
36 = 2x+5 + 3x-2 + 4x+6
36 = 9x + 9
9x = 36-9
x = 27/9
x = 3 cm
jadi :
sisi a = 2x = 2x3 = 6 cm
sisi b = 3x-2 = 3(3) - 2 = 7 cm
sisi c = 4x+6 = 4(3)+6 = 18 cm