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b=3x
c=2R =2*10cm
c=20cm
a²+b²=c²
x²+(3x)²=20²
x²+9x² =400
10x² =400 /:10
x² =40=4*10
x=√(4*10)
x=2√10 cm =a
b=3*2√10 =6√10cm
P=ab/2
P=2√10*6√10/2
P=6*10
P=60cm²