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4x + 14 = 30
x = (30-14):4
x = 4cm
luas segitiga= x(x+7) : 2
= 4 (11) : 2
= 22 cm2
30 CM = x + 2x+7 + x+7
30 cm = 4x + 14
30 - 14 = 4x
16 = 4x
4 = x
luas = axt/2
= (x+7) x 4/2
= (4+7) x 4 /2
= 11 x 4 / 2
= 44/2
= 22 cm2