Figure 125 : Angles in circle
Q01. Diagram
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Q02. Angles in circle
Defintion
- Draw a circle with center at O
- Draw chord AB and AC
- Draw tangent BD
- Angle BOC is called central angle and equal arc in radians
- Angle BAC is called circumed angle and equal half of arc inradian
- Angle BAC = (angle BOC)/2
- Angle DBC is call tangnet chord angle
- Angle DBC = angle BAC
- Angle BOC = measure of arc BC in radians
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Q03. Formula about arc
- 1. Arc length = Radius*(arc in radian)
- 2. Sector area BOC = pi*(radius^2)/2
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Q04. Reference
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Q05. Questions
- 1. What is the length of circumference ?
- 2. What is area of a circle ?
- 3. What is pi ?
- 4. What is the locus if point P keeps same distance to fixed point C ?
- 5. Triangle ABC inscribed circle. If AB is diameter, what is angle C ?
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