I see that you uploaded an image of a math problem. I will first analyze the content and then provide an explanation or solution for the problem. Let's break down the problem:

Problem 24:

Given a circle $O$ with diameter $AB$, on one side of the line $AB$, the tangents $Ax$ and $By$ are drawn, both of which are perpendicular to the line $AB$. Let $M$ be a point on the line $Ax$, which is not on the circle, and the tangent from point $M$ touches the circle at $N$.

a) Calculate $MON$.

b) Prove that $MN = AM + BN$.

c) Prove that $AM \cdot BN = R^2$, where $R$ is the radius of the circle.

I will now proceed to the steps of solving this. Let me know if you'd like me to clarify or explain anything further!