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

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