5²+12²=d²
25+144=d²
d²=169
d=13
r=1/2d
r=1/2*13
r=6,5
P=πr²
P=6,5²π
P=42,25π
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5²+12²=d²
25+144=d²
d²=169
d=13
r=1/2d
r=1/2*13
r=6,5
P=πr²
P=6,5²π
P=42,25π