Question

сколько касательных можно провести к окружности через точку лежащую на окружности

Answer 1

Толька одну) 

Сам попробуй начертить всё поймешь))

 

Answer 2

Из точки, лежащей вне окружности, можно провести к ней не более двух касательных.

Answer 3

Number of Tangents to a Circle through a Point on the Circle

When a point lies on a circle, the number of tangents that can be drawn to the circle through that point is two.

This can be explained by the fact that a tangent to a circle at a given point is perpendicular to the radius of the circle at that point. Since a circle has an infinite number of radii, there are also an infinite number of tangents that can be drawn to the circle. However, when a point lies on the circle, only two distinct tangents can be drawn through that point.