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2A= D•d
2A/D= d
d= 2A/D
A= (B+b)•h/2
2A=( B+b)•h
2A/(B+b)=h
h= 2A/(B+b)
A=(B+b)•h/2
2A= (B+b)•h
2A/h= B+b
B= 2A/h -b
B=
2A
—— - b
h
A= 4 π r²
A/4π= r²
r= √A/4π