12 multiple-choice questions, progressively harder.
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. The degree measures of arcs AB,CDAB,CDAB,CD are 3x+83x+83x+8 and 5x+125x+125x+12. Angle APBAPBAPB is 74∘74^\circ74∘. Find xxx.
Solution
Correct answer: C
The two arc measures add to twice the inside angle.
Substitution gives positive arcs of 56 and 92 degrees; the other two can each be 106 degrees.
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 far and near arc measures, in degrees, are 8x+308x+308x+30 and 2x+62x+62x+6. Angle APDAPDAPD is 66∘66^\circ66∘. Find xxx.
Correct answer: A
The far-minus-near difference is twice 66.
The arcs are 174 and 42 degrees, leaving 144 positive degrees for the other two arcs.
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 46∘46^\circ46∘, and angle TPATPATPA is 67∘67^\circ67∘. Find the far arc.
Correct answer: D
Twice the exterior angle is the difference of the selected arcs.
The third arc measures 134 degrees, so a semicircular far route is possible.
Rays PT,PUPT,PUPT,PU are tangent to one circle at distinct T,UT,UT,U, with PPP strictly outside. The minor arc TUTUTU measures (4x+15)∘(4x+15)^\circ(4x+15)∘, and angle TPUTPUTPU measures (3x+18)∘(3x+18)^\circ(3x+18)∘. Find xxx.
Correct answer: B
The minor arc and exterior tangent angle are supplementary.
The minor arc is 99 degrees, the major arc is 261 degrees, and the angle is 81 degrees.
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 114∘114^\circ114∘, and consecutive arcs AB,BCAB,BCAB,BC are 95∘,70∘95^\circ,70^\circ95∘,70∘. Find m∠BPCm\angle BPCm∠BPC.
The adjacent angle is supplementary to APB.
For a full-circle check, arc CD is 133 degrees and arc DA is 62 degrees. Their four-arc sum is 360 degrees.
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 far arc is 231∘231^\circ231∘, and the near arc is 49∘49^\circ49∘. Find m∠APDm\angle APDm∠APD.
The selected far route is major. Subtracting the near arc still gives the angle between the rays toward the circle.
The other two arcs may each be 40 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 38∘38^\circ38∘, and angle TPATPATPA is 92∘92^\circ92∘. Find the arc ABABAB excluding TTT.
First recover far arc BT from the exterior angle.
The three consecutive arcs fill the circle.
Rays PT,PUPT,PUPT,PU are tangent to one circle at distinct T,UT,UT,U, with PPP strictly outside. The minor arc TUTUTU measures (5x−10)∘(5x-10)^\circ(5x−10)∘, and angle TPUTPUTPU measures (2x+15)∘(2x+15)^\circ(2x+15)∘. Find the major arc from TTT to UUU.
Use the supplementary relation to find x.
The minor arc is 115 degrees, so the major arc is
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. Consecutive arcs AB,CDAB,CDAB,CD measure 86∘,124∘86^\circ,124^\circ86∘,124∘. Angle BPCBPCBPC measures (3x+9)∘(3x+9)^\circ(3x+9)∘. Find xxx.
The selected arcs first give angle APB. Its adjacent angle then supplies an equation.
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 far arc is 186∘186^\circ186∘ and the near arc is 54∘54^\circ54∘. Find the exterior angle BDCBDCBDC of triangle PBDPBDPBD.
Angle BDC is inscribed and intercepts the far arc BC excluding D. It is exterior to triangle PBD because DP and DC are opposite rays.
It is also the sum of the 66-degree angle at P and the 27-degree angle at B.
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 and far arcs measure 72∘72^\circ72∘ and 188∘188^\circ188∘. Point YYY lies on the secant line with order Y,P,A,BY,P,A,BY,P,A,B. Find m∠TPYm\angle TPYm∠TPY.
The half-difference gives the angle between PT and PA.
Ray PY is opposite PA, so the requested angle is its supplement.
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 98∘98^\circ98∘, and consecutive arc BCBCBC is 84∘84^\circ84∘. Find consecutive arc DADADA.
Arcs AB and CD total twice APB. The other two arcs make up the rest of the circle.
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