Find the area of a semi circle of radius 7cm
To find the area of a semicircle, we need to divide the area of a full circle by 2.
The formula for the area of a circle is:
A = πr²
In this case, the radius (r) is 7 cm.
So, the area of a full circle with a radius of 7 cm is:
A = π(7)²
A = π(49)
A = 49π
To find the area of a semicircle, we divide the area of a full circle by 2:
A_sem = 49π / 2
Using the approximate value of π as 3.14 (rounded to two decimal places), we can calculate the area of a semicircle:
A_sem = 3.14 * 49 / 2
A_sem = 153.86 cm²
Therefore, the area of a semicircle with a radius of 7 cm is approximately 153.86 cm².