Table of Contents
What is the area of a 9 radius circle?
A=πr2 The area of a circle is π times its radius squared. We have: 9=πr2 Divide both sides by π . ⇒9π=r2 Apply square root on both sides.
What is the circumference of a radius of 9?
| Example | |
|---|---|
| Problem | Find the circumference of the circle. |
| Answer | The circumference is 9 or approximately 28.26 inches. |
What are the measurements of a circle?
Definitions
- Radius is the length from the midpoint of the circle to the outer edge of the circle.
- Diameter is the full length of the circle running from the edge, through the midpoint, all the way to the other side.
- Now, circumference is the distance around the outside edge of this circle.
How to calculate the radius of a circle?
The radius of a circle calculator uses the following area of a circle formula: Area of a circle = π * r 2 Area of a circle diameter. The diameter of a circle calculator uses the following equation:
How do you find the area of a circle?
Area of a circle diameter. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Where: π is approximately equal to 3.14. It doesn’t matter whether you want to find the area of a circle using diameter or radius – you’ll need to use this constant in almost every case.
Why are units of length shown in circle calculator?
Units: Note that units of length are shown for convenience. They do not affect the calculations. The units are in place to give an indication of the order of the results such as ft, ft 2 or ft 3. Any other base unit can be substituted.
Which is the cut off part of a circle?
>A sector of a circle is section of a circle between two radii. You can think of it as a giant slice of pizza. >It’s a “cut-off” part of a circle, limited by a chord or a secant. >It’s an angle with the vertex in the center, whose arms extend to the circumference.