Question 237227
Let pi= the constant c
Let r1=rx, r2=ry and r=rz (less confusion for me)
1)
c*r^2=A
Ax+Ay=Az
cx^2+cy^2=cz^2
b) x^2+y^2=z^2 divide each side by c
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2)
2cr=C
2cx+2cy = 2cz
a) x+y=z divide each side by 2c.
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Ed