# Circle Vocabulary-Beginning Geometry

Geometry can be a fun Math subject if you can understand the basic vocabulary.
In the video above I illustrate several key vocabulary words that will help with your understanding of circles.

• Center The point of a circle in which all points of the circle are the same distance away.
• Radius The length from the middle of the circle to any point on the circle
• Diameter The Distance across the circle
• Circumference The Length around the circle
• Area The amount of space in the circle
• Tangent A line that intersects the circle at one particular point
• Secant A line that intersects a circle at two points
• Arc The length around a portion of the circumference
• Minor arc an arc with a measure less than 180 degrees
• Key arc an arc with a distance higher than 180 degrees
• Semi-circle an arc measuring exactly 180 degrees
• Central Angle angle with a vertex in the middle of the circle and the endpoints lie on the circle
• The central angle equals the arc measure
• Inscribed angle an angle in which the vertex lies on the circle and the end point is on the circle
• Inscribed angle equals half the intercepted arc

Geometry Teachers Never Spend Time Trying to Find Materials for Your Lessons Again!