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Angle Relationships in Circles 10.5 10.5 Angle Relationships in Circles EEssentialssential QQuestionuestion When a chord intersects a tangent line or another chord, what relationships exist among the angles and arcs formed? Angles Formed by a Chord and Tangent Line Work with a partner. Use dynamic geometry software. a. Construct a chord in a circle. At Sample one of the endpoints of the chord, construct a tangent line to the circle. b. Find the measures of the two angles C B formed by the chord and the tangent line. c. Find the measures of the two A circular arcs determined by the chord. d. Repeat parts (a)–(c) several times. D Record your results in a table. Then write a conjecture that summarizes the data. Angles Formed by Intersecting Chords Work with a partner. Use dynamic geometry software. a. Construct two chords that Sample intersect inside a circle. b. Find the measure of one D CONSTRUCTING of the angles formed by the B VIABLE ARGUMENTS intersecting chords. To be profi cient in math, c. Find the measures of the arcs C you need to understand intercepted by the angle in part (b) A and use stated assumptions, and its vertical angle. What do defi nitions, and previously you observe? E established results. d. Repeat parts (a)–(c) several times. Record your results in a table. Then write a conjecture that summarizes the data. CCommunicateommunicate YourYour AnswerAnswer 3. When a chord intersects a tangent line or another chord, what relationships exist 148° among the angles and arcs formed? m m ∠ 1 4. Line is tangent to the circle in the fi gure at the left. Find the measure of 1. 5. Two chords intersect inside a circle to form a pair of vertical angles with measures of 55°. Find the sum of the measures of the arcs intercepted by the two angles. Section 10.5 Angle Relationships in Circles 561 hhs_geo_pe_1005.indds_geo_pe_1005.indd 561561 11/19/15/19/15 22:37:37 PMPM 10.5 Lesson WWhathat YYouou WWillill LLearnearn Find angle and arc measures. Core VocabularyVocabulary Use circumscribed angles. circumscribed angle, p. 564 Finding Angle and Arc Measures Previous tangent TTheoremheorem chord secant Theorem 10.14 Tangent and Intersected Chord Theorem If a tangent and a chord intersect at a point on a circle, B then the measure of each angle formed is one-half the C measure of its intercepted arc. 2 1 A m∠1 = 1 mAB m∠2 = 1 mBCA Proof Ex. 33, p. 568 2 2 Finding Angle and Arc Measures Line m is tangent to the circle. Find the measure of the red angle or arc. a. A b. K m 130° 125° L 1 J B m SOLUTION 1 ២ m∠ = — ° = ° m KJL = ° = ° a. 1 2 (130 ) 65 b. 2(125 ) 250 MMonitoringonitoring PProgressrogress Help in English and Spanish at BigIdeasMath.com Line m is tangent to the circle. Find the indicated measure. ២ ២ 1. m∠1 2. m RST 3. m XY m m S m 1 ° Y 80° T 98 X 210° R CCoreore CConceptoncept Intersecting Lines and Circles If two nonparallel lines intersect a circle, there are three places where the lines can intersect. on the circle inside the circle outside the circle 562 Chapter 10 Circles hhs_geo_pe_1005.indds_geo_pe_1005.indd 562562 11/19/15/19/15 22:37:37 PMPM TTheoremsheorems Theorem 10.15 Angles Inside the Circle Theorem D If two chords intersect inside a circle, then the measure of A sum 1 each angle is one-half the of the measures of the arcs 2 C intercepted by the angle and its vertical angle. B m∠1 = 1 (mDC + mAB ), 2 Proof Ex. 35, p. 568 m∠2 = 1 (mAD + mBC ) 2 Theorem 10.16 Angles Outside the Circle Theorem If a tangent and a secant, two tangents, or two secants intersect outside a circle, then the measure of the angle formed is one-half the difference of the measures of the intercepted arcs. B P X Q A W 1 2 3 Z C R Y m∠1 = 1 (mBC − mAC ) m∠2 = 1 (mPQR − mPR ) m∠3 = 1 (mXY − mWZ ) 2 2 2 Proof Ex. 37, p. 568 Finding an Angle Measure Find the value of x. a. ° b. C D 130 M ° x° B 76 J L x° 178° K A 156° SOLUTION — — a. The chords JL and KM intersect b. The tangent CD៮៮៮⃗ and the secant CB៮៮៮⃗ inside the circle. Use the Angles intersect outside the circle. Use the Inside the Circle Theorem. Angles Outside the Circle Theorem. 1 ២ ២ 1 ២ ២ x° = — m JM + m LK m∠BCD = — m AD − m BD 2 ( ) 2 ( ) 1 1 x° = — ° + x° = — ° − 2 ( 130 156°) 2 ( 178 76°) x = 143 x = 51 So, the value of x is 143. So, the value of x is 51. MMonitoringonitoring PProgressrogress Help in English and Spanish at BigIdeasMath.com Find the value of the variable. 4. y° 5. F A B a° 102° K 44° C G D J H 95° 30° Section 10.5 Angle Relationships in Circles 563 hhs_geo_pe_1005.indds_geo_pe_1005.indd 563563 11/19/15/19/15 22:37:37 PMPM Using Circumscribed Angles CCoreore CConceptoncept Circumscribed Angle A A circumscribed angle is an angle B whose sides are tangent to a circle. circumscribed C angle TTheoremheorem Theorem 10.17 Circumscribed Angle Theorem A The measure of a circumscribed angle is equal to 180° minus the measure of the central angle that intercepts D C the same arc. B Proof Ex. 38, p. 568 m∠ADB = 180° − m∠ACB Finding Angle Measures Find the value of x. a. D b. E A J x° x° ° G 135 ° C H 30 B F SOLUTION a. Use the Circumscribed Angle Theorem to fi nd m∠ADB. m∠ADB = 180° − m∠ACB Circumscribed Angle Theorem x° = 180° − 135° Substitute. x = 45 Subtract. So, the value of x is 45. b. Use the Measure of an Inscribed Angle Theorem (Theorem 10.10) and the Circumscribed Angle Theorem to fi nd m∠EJF. 1 ២ m∠EJF = — m EF 2 Measure of an Inscribed Angle Theorem 1 m∠EJF = — m∠EGF 2 Defi nition of minor arc 1 m∠EJF = — ° − m∠EHF 2 (180 ) Circumscribed Angle Theorem 1 m∠EJF = — ° − ° 2 (180 30 ) Substitute. 1 x = — − 2 (180 30) Substitute. x = 75 Simplify. So, the value of x is 75. 564 Chapter 10 Circles hhs_geo_pe_1005.indds_geo_pe_1005.indd 564564 11/19/15/19/15 22:37:37 PMPM Modeling with Mathematics The northern lights are bright fl ashes of colored C light between 50 and 200 miles above Earth. A BD fl ash occurs 150 miles ២above Earth at point C. What is the measure of BD , the portion of Earth from which the fl ash is visible? (Earth’s radius 4150 mi 4000 mi is approximately 4000 miles.) A E SOLUTION Not drawn to scale 1. Understand the Problem You are given the approximate radius of Earth and the distance above Earth that the fl ash occurs. You need to fi nd the measure of the arc that represents the portion of Earth from which the fl ash is visible. 2. Make a Plan Use properties of tangents, triangle congruence, and angles outside a circle to fi nd the arc measure. — — — — — — 3. Solve the Problem Because CB and CD are tangents, CB ⊥ AB and CD ⊥ AD BC— ≅ DC— by the Tangent Line to Circle Theorem (Theorem 10.1). Also, — — by the External Tangent Congruence Theorem (Theorem 10.2), and CA ≅ CA by the Refl exive Property of Congruence (Theorem 2.1). So, △ABC ≅ △ADC by the Hypotenuse-Leg Congruence Theorem (Theorem 5.9). Because corresponding COMMON ERROR parts of congruent triangles are congruent, ∠BCA ≅ ∠DCA. Solve right △CBA to fi nd that m∠BCA ≈ 74.5°. So, m∠BCD ≈ 2(74.5°) = 149°. Because the value for m∠BCD is an m∠BCD = 180° − m∠BAD Circumscribed Angle Theorem ២ approximation, use the m∠BCD = 180° − m BD Defi nition of minor arc symbol ≈ instead of =. ២ 149° ≈ 180° − m BD Substitute. ២ ២ 31° ≈ m BD Solve for m BD . The measure of the arc from which the fl ash is visible is about 31°. 4. Look Back You can use inverse trigonometric ratios to fi nd m∠BAC and m∠DAC. m∠BAC = cos−1 —4000 ≈ 15.5° ( 4150) 4000 m∠DAC = cos−1 — ≈ 15.5° ( 4150) ២ So, m∠BAD ≈ 15.5° + 15.5° = 31°, and therefore m BD ≈ 31°. Monitoring Progress Help in English and Spanish at BigIdeasMath.com Find the value of x. 6. 7. T K x° P B R N x° 120° M CD Q L 50° 4002.73 mi S A 4000 mi 8. You are on top of Mount២ Rainier on a clear day. You are about 2.73 miles above sea level at point B. Find m CD , which represents the part of Earth that you can see. Not drawn to scale Section 10.5 Angle Relationships in Circles 565 hs_geo_pe_1005.indd 565 3/9/16 9:31 AM 10.5 Exercises Dynamic Solutions available at BigIdeasMath.com VVocabularyocabulary andand CoreCore ConceptConcept CheckCheck ⃖៮៮⃗ ⃖៮៮⃗ 1. COMPLETE THE SENTENCE Points A, B, C, and D are on a circle, and AB intersects CD at point P. 1 ២ ២ m∠APC = — m BD − m AC P If 2 ( ), then point is ______ the circle. 2. WRITING Explain how to fi nd the measure of a circumscribed angle. MMonitoringonitoring ProgressProgress andand ModelingModeling withwith MathematicsMathematics In Exercises 3–6, line t is tangent to the circle.
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