To find the area of a half circle, you first need to know the formula for the area of a full circle, which is:
Area = π * r²
In this formula, r represents the radius of the circle, and π (pi) is a constant approximately equal to 3.14159.
Since we are dealing with a half circle, you simply divide the area of the full circle by two:
Area of Half Circle = (π * r²) / 2
To illustrate this, let’s say the radius of your half circle is 4 units. Here’s how you would calculate it:
- First, square the radius: 4 * 4 = 16.
- Multiply by π: 16 * π ≈ 50.27.
- Now, divide by 2: 50.27 / 2 ≈ 25.14.
So, the area of the half circle with a radius of 4 units is approximately 25.14 square units.
In summary, to find the area of a half circle, use the formula (π * r²) / 2 and simply plug in the radius.