Question 1061382
{{{drawing(300,300,-12,28,-29,11,
circle(0,0,25),circle(0,0,0.5,0.5),
red(rectangle(15,-25,25,-20)),
red(rectangle(0,-25,15,-20)),
line(-12,-25,29,-25),
green(triangle(0,-20,0,0,15,-20)),
green(rectangle(0,-20,2,-18)),
locate(0.5,-9,R-5),locate(7,-18,15),
locate(7,-10,R),locate(0.6,0.9,"<--- axle"),
locate(0.5,-21,red(5)),locate(15.5,-21,red(5))
)}}} The Pythagorean theorem says that {{{R^2=(R-5)^2+15^2}}} .
{{{R^2=(R-5)^2+15^2}}}
{{{R^2=R^2-10R+25+225}}}
{{{0=-10R+250}}}
{{{10R=250}}}
{{{R=250/10}}}
{{{highlight(R=25)}}}