the longest straight line that can be drawn to connect two points on the circumference of a circle whose radius is 9 inches is...

Answer 1

The longest straight line that can be drawn to connect two points on the circumference of a circle is the diameter of the circle. The diameter can be calculated using the radius.

The formula for the diameter $d$ of a circle is:

$$d=2\times r$$

Where $r$ is the radius of the circle. Given that the radius $r$ is 9 inches, the diameter would be:

$$d=2\times 9=18\text{ inches}$$

Therefore, the longest straight line that can be drawn to connect two points on the circumference of the circle is 18 inches.