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144+25=x²
169=x² /√
13=x
Obwód= 4x = 4*13=52
2) 5²+x²=13²
25+x²=169
x²=144
x=12
Obw=34 cm
34=12+13+5+2y
34=30+2y
4=2y
2=y
a= x+y
a=12+2
a=14
P=1/2*a*h
P=1/2*14*5
P= 35 cm²