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a + b = 40
a - b = 18
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2a = 56
a = 28
b = 12
a + b = 21
a - b = 9
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2a = 30
a = 15
b = 6
3)
b = 3h
h = h
Perímetro = 2(b + h)
32 = 2b + 2h
32 = 6h + 2h
32 = 8h
4 = h
3(4) = 12 = b
Área = b.h/2 = 48/2 = 24u²