'Red angle' diaporamas de présentation

All Circles are Similar

All Circles are Similar. A circle is a set of all points that are equidistant to a given center point. If you dilate a circle, it will never change shape. ALL CIRCLES ARE SIMILAR TO EACH OTHER. Chords, Secants, and Tangents. Chord: A line segment that begins and ends on the circle. CHORD.

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12.4 Angle Measures in Circles

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Warm Up

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ANSWER

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EXAMPLE 1

=. a. m 1. 12. (130 o ). (125 o ). 2. =. b. m KJL. EXAMPLE 1. Find angle and arc measures. Line m is tangent to the circle. Find the measure of the red angle or arc. SOLUTION. = 65 o. = 250 o. =. m 1. 12. (210 o ). for Example 1. GUIDED PRACTICE.

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EXAMPLE 1

=. a. m 1. 12. (130 o ). (125 o ). 2. =. b. m KJL. EXAMPLE 1. Find angle and arc measures. Line m is tangent to the circle. Find the measure of the red angle or arc. SOLUTION. = 65 o. = 250 o. =. m 1. 12. (210 o ). for Example 1. GUIDED PRACTICE.

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EXAMPLE 1

=. a. m 1. 12. (130 o ). (125 o ). 2. =. b. m KJL. EXAMPLE 1. Find angle and arc measures. Line m is tangent to the circle. Find the measure of the red angle or arc. SOLUTION. = 65 o. = 250 o. =. m 1. 12. (210 o ). for Example 1. GUIDED PRACTICE.

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