Circle

Front 1

Line joining the center of a circle to any points on the circle. It is the most important measurement because other characteristics such as circumference and area of a circle can be solved when radius is known.

Back 1

RADIUS

Front 2

Portion of a circle that contains two endpoints and all the points on the circle between the endpoints. Choosing any two points on the circle, two arcs will be formed: major arc (longer arc), and a minor arc (shorter arc)

Back 2

Arc

Front 3

Line segment joining any two points on the circle. The chord passes through the center of the circle is the diameter of the circle. The diameter is twice the length of the radius, which is the longest chord of the circle. A chord divides the circle into two regions: major segment and minor segment.

Back 3

CHORD

Front 4

Region bounded by two radii joining the center of a circle and an included arc. The central angle is the angle whose vertex lies at the center of the circle and whose sides are the two radii. The inscribed angle is the angle whose vertex lies on the circle and whose two sides are chords of the circle

Back 4

Sector

Front 5

is a straight line which touches the circle at only one point. This point is known as point of tangency. The tangent to a circle is perpendicular to the radius at the point of tangency. A line that intersects the circle at two points is called secant line.

Back 5

Tangent

Front 6

These are two circles that are tangent to the same line at the same point. When two circles in the same plane intersect in exactly one point and their centers are lying on one side of their common tangent, the two circles are said to be internally tangent. And when two circles intersect at one point, but the

Back 6

Tangent circles

Front 7

quadrilateral which circumscribed in a circle . It means that all the four vertices of quadrilateral lie in the circumference of the circle. Take note that the sum of the opposite angles of a cyclic quadrilateral is 180 degrees. A

Back 7

Cyclic Quadrilateral