perimeter of a semi circle with the radius of 11
Answers
This formula is used to calculate the distance around a circle. (CIRCUMFERENCE)
C = (PI)(D) (Circumference = PI times the DIAMETER.)
C = (PI)(2R) (Circumference = PI times the radius doubled.)
C = (3.14)(2)(11) = (3.14)(22) = 69.08
However, we need ONE-HALF this distance, since a SEMI-CIRCLE is one-half of a full circle.
C of our semi-circle = (.5)(69.08) = 34.54 cm
And ROUNDED to one decimal place is 34.5 cm.
Step-by-step explanation:
The perimeter, or circumference, or total distance around a circle is a little more than 3 times the distance across the circle. We call this ratio of the distance around the circle to the distance across the circle PI.
PI is approximately 3.14 or 3 1/7. For example, the earth is approximately 8,000 in diameter. That means the distance around the earth is more than 24,000 miles. Hummmm, 24 hours in a day. Check out latitude and longitude. But that's for another day.