Stepp's Prentice Hall Ch 12 Circles - pictures included try targets
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| If a line is tangent to a circle, then it is ___ to the radius at the point of tangency | perpendicular
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| A tangent line intersects with a circle exactly __ time(s) | 1
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| Two tangents to a circle from from the same point are ___ | congruent
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| Congruent central angles have congruent ____ | chords
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| Congruent chords have ___ arcs | congruent
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| congruent arcs have congruent ___ angles | central
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| Chords ___ from the center are congruent | equidistant
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| If a two chords are equidistant from the center, they are ___ | congruent
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| A chord (and its arc)that is perpendicular to a radius or diameter is also ____ by it. | bisected
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| The perpendicar bisector bisector of a chord contains the ___ | center
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| inscribed angles are always ___ the arc measure | half
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| T or F: Inscribed angles are equal to central angles | False, they are half
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| T or F: Arc Measure is the same as the measure of the central angle | True
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| T or F: You can make an inscribed angle with a radius and another radius. | False, (2 chords)
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| T or F: The vertex of an inscribed angle is at the center of the circle. | False, (on the circle)
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| T or F: The longest chord you can get from a circle is diameter | True
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| Two inscribed angles that have the same ___ are congruent | arc
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| An inscribed angle whose arc is a semicircle is ___ | 90 degrees
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| Opposite angles of a ____ inscribed in a circle are supplementary | quadrilateral
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| A secant is a line that intersects a circle in ___ point(s) | two
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| The angle formed by a tangent and a ___ is half the measure of the intercepted arc | chord
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| When two lines intersect ____ a circle, the angle they form is half the sum of the two intercepted ars they form. | inside
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| When two lines intersect ____ a circle, the angle they form is half the difference of the two intercepted ars they form. | outside
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| The center of a circle has coordinates (__, __) | (h,k)
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| True or False: A semicircle has an inscribed angle of 180 degrees. | False, (arc measure and central angle are 180, inscribed angle is half that or 90.)
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| To write the equation of a circle in standard form, you need to know the center and the ____ | length of the radius
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| When finding the angle formed by two lines that cross outside the circle you take half the ____ arc minus ___acr formed by the lines | bigger, smaller
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| The point (h,k) is ____ | the center of a circle
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| The value of h in the std form of the equation of a circle is ___ | Whatever you are subtracting from x
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| The value of k in the std form of the equation of a circle is ___ | Whatever you are subtracting from y
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| To write the equation of a circle, you have to have the ___ and the ____ | center, radius
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| To find the radius of a circle when all you have is the center and a point on the circle, you solve for r by inserting your ___ and ___ values. | center, point(h,k), (x, y)
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