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Radius
Diameter
Perimeter
Arc length
Area
Parts of the Semi-Circle
Semi-Circle Formulas
Facts About the Semi-Circle
- A semi-circle contains 180 degrees as opposed to a circle with 360 degrees, Hence the name semi-circle.
- A quarter circle is half a semi-circle (90°).
- An arc is the curved portion of the semi-circle’s edge.
Fun Trivia
- Found in nature and objects such as rainbows, quarter moons, protacters, open paper fans, and so much more.
- The arch, a semi-circle, is common in architecture due to it’s durability.
- A right triangle is formed when straight lines are drawn from each end and the where the line meet anywhere on the arc (Thales’ theorem).
- An arbelos is formed when three semi-circles are placed at their endpoints and are on the same side of the baseline.
- The is some debate if the corners where the arc and diameter meet are true corners.
Fun Trivia
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