Question

if the diameter is perpendicular to an outside line to the circle

Answer 1

Answer:

Step-by-step explanation:

A tangent to a circle is perpendicular to the radius through the point of contact. Given :- A circle C (O, r) and a tangent AB at a point P. Construction :- Take any point Q, other than P, on the tangent AB.

Answer 2

The triangle AB'B is a right triangle because it's a triangle inscribed in a circle with one of its side as a diameter.

This gives you that, for the triangle APP',

• PB' is the altitude from the vertex P
• P'A' is the altitude from the vertex P'
• So B, the intersection of PB' and P'A', is the orthocentre.

It follow that AB is the altitude from the vertex A, hence AB and PP' are perpendicular