Today in class we recieved are tests back, corrected them, and continued studying chapter 9: circles.
In the test, no one got number ten right and Mrs. Saatkamp got really mad because no one knew what was the formula to solve quadratic equations.
Quadratic formula:
Central Angle: an angle whose vertex is the center.
The sum of all central angles will always be 360º.
Arcs: a portion of the circumference of a circle.
- minor arc: smaller arc (represented by 
)
) - major arc: bigger arc (usually represented by 
)
)The MEASURE of an arc is equal to its central angle.
The LENGTH of an arc is the ratio of central angle:360º times the circumference.
Semicircle: an arc whose central angle is equivalent to 180º.
Postulate 9-1: Arc Addition postulate.
two ADJACENT arcs can be added two form a greater one.
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