Think!
The diagram shows the inscribed circle of a right-angled triangle. The sides of the triangle are a, b and c. The radius of the circle is r.
ab = r(a + b + c)
Can you prove it?
Please enable Java for an interactive construction (with Cinderella).
This diagram illustrates a possible proof. Can you see it?
Please enable Java for an interactive construction (with Cinderella).
The diagram shows the inscribed
circle of a right-angled triangle. The sides of the triangle are a, b and c.
The radius of the circle is r.