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R = 1/2c
c = 34cm
r = 6cm
r = (a + b - c)/2
6 = a + b - 34/2
12 = a + b - 34
a + b = 46
P = 1/2l * r
P = 1/2 * (46 + 34) * 6 = 1/2 * 80 * 6 = 240cm²