



 
Hi Mercede, I redrew the diagram you sent and added some lines and dimensions. I let the radius of the circle be r mm and I drew a line segment from the centre of the circle to the point where the rectangle touches the circle. The length of this line segment is r mm. I then constructed a right triangle with this line segment as the hypotenuse. What does Pythagoras' theorem tell you about this triangle? Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 