Question

The longest chord of a circle is $18\text{cm}$. What is the radius of the circle?

Answer 1

The longest chord of the circle is the diameter.

So, Diameter of the circle = $18\text{cm}$

Then, radius of the circle = Diameter $÷2$

= $18÷2$

= $\text{9 cm}$

Hence, the radius of the circle is $9\text{cm}$.