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a=3x
b=4x
c=25 cm
a²+b²=c²
(3x)² +(4x)²=25²
9x²+16x² =25²
25x² =25² /:25
x²=25
x=√25
x=5cm
a=3*5=15cm
b=4*5 =20cm
r=(15+20-25)/2
r=10/2
r=5 cm