Introduction to CIRCLES MATHEMATICS GRADE 7 SECONDARY
- 2. CIRCLE
- 3. OBJECTIVE: a.Illustrate a circle and the terms related to it: radius,diameter, chord, center, arc, central angle,and inscribed angle.
- 4. What is Circle? Circle is a set of infinitely many points equidistant from a fixed point called the center.
- 5. Center - it is the fixed or given point in the circle. It is also used to name the circle. Radius - it is a segment whose endpoints are the center and any point on the circle. It is half of the diameter. The plural form of radius is called radii. Diameter - it is a segment whose endpoints are any two points on the circle and passes through the center. It is also the longest chord.
- 7. Chord - it is a segment whose endpoints are any two points on the circle. Tangent - it is a line that touches the circle at exactly one point called the point of tangency. Secant - it is a line that intersects the circle at two points.
- 9. Minor Arc - it is an arc less than half a circle (less than 180°). Semi-circle -it is an arc that measures half a circle (exactly 180°). Major Arc - it is an arc more than half a circle (more than 180°).
- 11. Central angle - it is an angle whose vertex is the center of the circle and sides are two radii. Inscribed angle - it is an angle whose vertex is a point on the circle and sides are two chords.
- 16. ACTIVITY