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anonymous

  • one year ago

Given: Line DR tangent to Circle O. If m Arch DB = 150°, then Angle A = a) 75 b) 105 c) 150

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  1. anonymous
    • one year ago
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    https://suwannee.owschools.com/media/g_geo_2013/7/group179.gif

  2. anonymous
    • one year ago
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    @Dan815

  3. anonymous
    • one year ago
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    @Dan815

  4. anonymous
    • one year ago
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    @SolomonZelman

  5. anonymous
    • one year ago
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    Please somebody help

  6. anonymous
    • one year ago
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    :(

  7. anonymous
    • one year ago
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    Will Medal If answered!

  8. phi
    • one year ago
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    arc DB is 150. any idea what arc BD (the long way ) is ? (notice together DB + BD is all the way round the circle)

  9. anonymous
    • one year ago
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    Yeah and a circle is 360 degrees

  10. anonymous
    • one year ago
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    So BD is 210 right?

  11. anonymous
    • one year ago
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    But what about angle A?

  12. phi
    • one year ago
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    yes. now use the idea that angle A is an inscribed angle |dw:1435583138900:dw|

  13. phi
    • one year ago
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    if you learn one fact about circles, it is that inscribed angles are 1/2 of the "intercepted arc"

  14. anonymous
    • one year ago
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    Oh okay

  15. anonymous
    • one year ago
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    Then wouldn't it be 75?

  16. anonymous
    • one year ago
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    No wait. I think that's wrong

  17. phi
    • one year ago
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    1/2 of the intercepted arc, (the arc I showed with the squiggle line)

  18. anonymous
    • one year ago
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    Oh then it's 105

  19. phi
    • one year ago
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    Yes

  20. anonymous
    • one year ago
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    Sorry I got a little confused

  21. anonymous
    • one year ago
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    Thanks I really appreciate it so much!

  22. phi
    • one year ago
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    yw

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