Atangent from point p to a circle of radius 4 cm is 10 cm long. find:
a the distance of p from the centre of the circle
b the size of the angle between the tangent and the line joining p to the centre of the
circle.

see explanation

Step-by-step explanation:

a

The tangent and the radius at the point of contact form a right angle

Using Pythagoras' identity on the right triangle formed.

Let x be the distance from the centre to P, then

x² = 4² + 10² = 16 + 100 = 116 ( take the square root of both sides )

x = ≈ 10.77 cm (to 2 dec. places )

b

let the required angle be Θ, then

Using the sine or cosine ratio in the right triangle.

cosΘ = =

Θ = ( ) ≈ 21.8°