Question

the length of a tangent to a circle from a point which is at a distance of 5cm from the centre of a the circle is 4cm.Find the radius​

Answer 1

Answer:

Length of the Tangent to a Circle. It is observed that |TC| is the radius of the circle, so |TC|2=g2+f2–c. This gives the length of the tangent from the point P(x1,y1) to the circle x2+y2+2gx+2fy+c=0.

Answer 2

Step-by-step explanation:

radius = 3 cm

by pythagoras theorem

a² + b² = c²

5² = 4² + r²

r² = 25 -16

r² =9

r = 3 cm