Question

If the radius of a circle is r units ,then express the length of a diameter of the circle in terms of r

Answer 1

Diameter is just the double of radius so diameter of circle whose radius is r units can written as : 2r or r + r.

Hope it will help

Answer 2

GIVEN :

radius of a circle is = r units

TO DO :

express the length of a diameter of the circle in terms of r

FORMULA USED :

radius of circle = (diameter of circle )/ 2

SOLUTION :

We know radius of circle = (diameter of circle )/ 2

THEREFORE , According to the question :-

r = diameter of circle / 2

r × 2 = diameter of circle

2r = diameter of circle

ANSWER :

length of a diameter of the circle = 2r units

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More about circle :-

1. circumference of circle = 2πr

2. Area of circle = πr²