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Topic 5 A

Math Quiz

TermDefinition
The measure of an arc in degrees… Is given by the measure of the central angle which intercepts it.
In a circle or congruent circles, congruent central… Angles intercept congruent central arc.
An inscribed angle is… Measured by one half of its intercepted arc.
If 2 inscribed angles intercept… Congruent arcs or the same arc, they are congruent.
An angle inscribed in a semi circle… Is a right angle.
A line tangent to a circle is… Is perpendicular to the radius drawn to the point of tangency.
If a quadrilateral is inscribed in a circle… Then it’s opposite angles are supplementary.
Central angle of a circle An angle whose vertex is at the center of the circle
Inscribed angle An angle whose vertex is on a circle and whose sides contain chords of the circle
Arc length (degrees) (x °/360)2 πr
An angle formed by 2 chords x=1/2(mAB+mCD)
An angle formed by a chord and a tangent x=1/2nAB
Arc length radians S=0r
Conversion between degrees and radians 180/π=degrees/radians
 



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