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student3919

数学

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  • tayh
    2019-07-10 01:22:24
    (a) use angle in alternate segment (angle PQV = angle VTQ)
    (b) TVQ=90 (angle in semi-circle), as it said TWQ is a diameter
    then find angle SVQ
    then use angle in same segment to find y (angle QVS = angle QTS)
    (c)
    consider triangle TVS, find angle TSV first,
    then using the fact that quad TUVS is cyclic quad, angle VUT + angle TSV = 180 (opp angles, cyclic quad)
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