0
Pi X Radius Squared
Divide By 2
Add Diameter/Length Of Base
The area of a semi circle is 1/2 x pi x r2
Area of circle is pi (3.14) x square of radius. Divide that by two to get half-circle.
First you figure out what the area would be if it were an entire circle using the formula pi times the radius squared. Pi = approx 3.1416. Then if you know the angle (in degrees) that creates the semi circle divide that number by 360. Then multiply that number by the area of the circle.
The formula for the area of a circle is A = πr2 where r is the radius and π (Pi) is the ratio of the circumference of a circle to its diameter.
The area of a semicircle is thus half this quantity = πr2/2
Pi r2 is the area of a circle so 1/2(Pi r2 ) is area of half circle
Still curious? Ask our experts.
Chat with our AI personalities
Rafa
Ross
JordanAdd your answer:
Earn +20 pts
What is area of semicircle?
The area of a semicircle is half of the area of a circle. The area of a circle is pi x radius x radius. So the area of a semicircle is 1/2 x pi x radius x radius or (pi x radius x radius) / 2.
What is the area of a semicircle when the radius is 21?
The equation for area of a circle is A=pi x R x R. A semicircle is half a circle, so we calculate the area of a circle and divide by 2. The area of the circle would be approximately 1384.74. Thus the area of the semicircle would be 692.37.
How do you find the radius of a semicircle?
it is have the diameter
Area of a semicircle with a diameter of 8 cm?
25
What is the diameter of a semicircle?
In a semicircle, the diameter is the straight line. It is also equal to double the radius, and that property allows it to be used when calculating area and circumference.
