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144+a²=169
a²169-144
a=√25
a=5
Obw: 12*2+5*2=24+10=34.
b) (7,5)²+h²=(12,5)²
56,25+h²=156,25
h²=156,25-56,25=100
√100=10
10*2=20 <- wysokośc rombu.
Pole=20*15/2=150