12 multiple-choice questions, progressively harder.
Points A,B,C,DA,B,C,DA,B,C,D occur in order around a circle. Chords AC,BDAC,BDAC,BD meet at XXX. Side lines AB,DCAB,DCAB,DC meet at external PPP with orders P,A,BP,A,BP,A,B and P,D,CP,D,CP,D,C. Far arc BCBCBC excludes A,DA,DA,D; near arc DADADA excludes B,CB,CB,C. Angle AXBAXBAXB is 86∘86^\circ86∘, and angle APDAPDAPD is 41∘41^\circ41∘. Find the far arc BCBCBC.
Solution
Correct answer: B
The inside angle makes arcs AB and CD total 172 degrees, leaving 188 degrees for BC and DA. Their difference is 82 degrees.
The near arc is 53 degrees; arcs AB and CD can each be 86 degrees.
Points A,B,C,DA,B,C,DA,B,C,D occur in order around a circle. Chords AC,BDAC,BDAC,BD meet at XXX. Side lines AB,DCAB,DCAB,DC meet at external PPP with orders P,A,BP,A,BP,A,B and P,D,CP,D,CP,D,C. Far arc BCBCBC excludes A,DA,DA,D; near arc DADADA excludes B,CB,CB,C. Angle AXBAXBAXB is 98∘98^\circ98∘, angle APDAPDAPD is 27∘27^\circ27∘, and consecutive arc ABABAB is 67∘67^\circ67∘. Find the inscribed angle BADBADBAD.
Correct answer: D
The inside angle makes arcs AB and CD total 196 degrees, so arc CD is 129 degrees. The remaining arcs BC and DA total 164 degrees. Their difference is twice the exterior angle, or 54 degrees.
The inscribed angle BAD excludes A and intercepts the arc from B through C to D. That arc measures 238 degrees.
All four positive arcs total 360 degrees.
Ray PTPTPT is tangent at TTT, and a secant has order P,A,BP,A,BP,A,B. Near arc TATATA excludes BBB; far arc BTBTBT excludes AAA. The degree measures of near and far arcs are 3x+23x+23x+2 and 7x+187x+187x+18. Angle TPATPATPA is 48∘48^\circ48∘. Find arc ABABAB excluding TTT.
Correct answer: A
Use the angle difference first.
The near and far arcs are 62 and 158 degrees. The remaining arc is
Rays PT,PUPT,PUPT,PU are tangent to one circle at distinct T,UT,UT,U, with PPP strictly outside. In triangle PTUPTUPTU, angle PTUPTUPTU measures (2x+3)∘(2x+3)^\circ(2x+3)∘, and angle TPUTPUTPU measures (3x+6)∘(3x+6)^\circ(3x+6)∘. Point RRR lies on the major arc TUTUTU. Find major arc TRUTRUTRU.
Correct answer: C
The two base angles select the same minor arc, so both measure 2x+3 degrees.
The minor arc is twice the 51-degree base angle, or 102 degrees. Therefore
Points A,B,C,DA,B,C,DA,B,C,D occur in that order around a circle. Chords AC,BDAC,BDAC,BD cross at interior PPP. Angles APB,BPCAPB,BPCAPB,BPC measure (4x−2)∘,(2x+8)∘(4x-2)^\circ,(2x+8)^\circ(4x−2)∘,(2x+8)∘. Consecutive arc ABABAB is 88∘88^\circ88∘. Find consecutive arc CDCDCD.
The adjacent angles form a straight angle.
Double this inside angle and subtract arc AB.
Two secants from external PPP have orders P,A,BP,A,BP,A,B and P,D,CP,D,CP,D,C. The circle order is A,B,C,DA,B,C,DA,B,C,D. Far arc BCBCBC excludes A,DA,DA,D; near arc DADADA excludes B,CB,CB,C. The consecutive arcs AB,BC,CD,DAAB,BC,CD,DAAB,BC,CD,DA measure 30∘,270∘,30∘,30∘30^\circ,270^\circ,30^\circ,30^\circ30∘,270∘,30∘,30∘. Find the angle between rays PAPAPA and PDPDPD.
The far route BC is major and excludes both near points. The positive arcs sum to 360 degrees.
The acute 60-degree angle would use one reversed ray.
Ray PTPTPT is tangent at TTT, and a secant has order P,A,BP,A,BP,A,B. Near arc TATATA excludes BBB; far arc BTBTBT excludes AAA. The near arc is 42∘42^\circ42∘ and arc ABABAB excluding TTT is 96∘96^\circ96∘. Find m∠TPAm\angle TPAm∠TPA.
The far arc is the part left after the two given arcs.
Apply the exterior half-difference.
Two secants from external PPP have orders P,A,BP,A,BP,A,B and P,D,CP,D,CP,D,C. The circle order is A,B,C,DA,B,C,DA,B,C,D. Far arc BCBCBC excludes A,DA,DA,D; near arc DADADA excludes B,CB,CB,C. Angle APDAPDAPD is 54∘54^\circ54∘. The far and near arc measures, in degrees, are 5x+415x+415x+41 and 2x+172x+172x+17. Find the far arc.
Twice the exterior angle is the arc difference.
The requested route is
The near arc is 73 degrees, leaving 106 degrees for AB and CD.
Rays PT,PUPT,PUPT,PU are tangent to one circle at distinct T,UT,UT,U, with PPP strictly outside. Angle TPUTPUTPU is 116∘116^\circ116∘. Point RRR lies on the major arc TUTUTU. Find the inscribed angle TRUTRUTRU.
Recover the minor contact arc, then use the on-circle rule at R.
Points A,B,C,DA,B,C,DA,B,C,D occur in that order around a circle. Chords AC,BDAC,BDAC,BD cross at interior PPP. Angle APBAPBAPB is 96∘96^\circ96∘. The degree measures of consecutive arcs AB,CDAB,CDAB,CD are 2x+142x+142x+14 and 4x+224x+224x+22. Find the inscribed angle ACBACBACB.
First recover x from the inside half-sum.
Arc AB is 66 degrees. Angle ACB excludes C from that arc, so
Two secants from external PPP have orders P,A,BP,A,BP,A,B and P,D,CP,D,CP,D,C. The circle order is A,B,C,DA,B,C,DA,B,C,D. Far arc BCBCBC excludes A,DA,DA,D; near arc DADADA excludes B,CB,CB,C. Consecutive arcs AB,CDAB,CDAB,CD are 73∘,105∘73^\circ,105^\circ73∘,105∘. The degree measures of near arc DADADA and far arc BCBCBC are 2x+62x+62x+6 and 4x+144x+144x+14. Find m∠APDm\angle APDm∠APD.
Arcs AB and CD together measure 178 degrees. Therefore the two remaining arcs total 182 degrees.
The near arc is 60 degrees and the far arc is 122 degrees.
Ray PTPTPT is tangent at TTT, and a secant has order P,A,BP,A,BP,A,B. Near arc TATATA excludes BBB; far arc BTBTBT excludes AAA. The near arc is 58∘58^\circ58∘, and angle TPATPATPA is 55∘55^\circ55∘. Point VVV lies on the arc ABABAB excluding TTT. Find the inscribed angle TVBTVBTVB.
Recover the far arc BT, which excludes A and also excludes V on arc AB.
Angle TVB is half that route.
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