Question

the diameter of a circle is 7.8 cm find its radius ​

Answer 1

diameter =2× radius

7.8=2r

r=7.8/2=3.9cm.

hope this helps u....!!!!!

Answer 2

Given -

Diameter = 7.8 cm

To find -

Radius -

We know that ,

2Radius = Diameter

So,

2 Radius = 7.8 cm

Radius = 7.8/2 cm

Radius = 3.9 cm

more information -

Radius of the same circle is always similar .

Circumference of circle = 2πr

Area of Circle = πr²

here is your answer.... ....