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5² - 3² = a²
25 - 9 a²
16 = a²
a = √16 = 4
P= (a+b) * h / 2
30 = (4 + b) * 3 /2
60 = (4 + b) * 3
60 = 12 + 3b / -12
3b = 48 /÷ 3
b = 16
c = 16 + 2*4 = 16 + 8 = 24
Ob = a + b+ c + d
Ob = 16 + 24 + 5 + 5
Ob = 50