How do you calculate diameter size?

Answer 1

Circle Definition:

A circle is the set of all points in a plane at a fixed distance, called the radius, from a given point, the center.

Circle Formula:

Area of Circle = πr²

Diameter of Circle = 2r

Circumference of Circle = 2πr = πd

Area of Sector = πr²(θ/360)

where

r = radius

Circle Example:

Case 1: Find the area, diameter, and circumference of a circle with the given radius 3.

Step 1: Find the area.

Area = πr² = 3.14 * 3² = 3.14 * 9 = 28.26.

Step 2: Find the diameter.

Diameter = 2r = 2 * 3 = 6.

Step 3: Find the circumference.

Circumference = πd = 3.14 * 6 = 18.84.

Case 2: Find the area of sector with the given radius 3 and theta 30.

Step 1: Find the area.

Area =πr²(θ/360) = 3.14 * 3² * (30/360) = 3.14 * 9 * 0.083 = 2.35.

The above example will clearly illustrates how to calculate the Area, Diameter and Circumference of a Circle, Area of Sector manually.