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rinoa1989

  • 3 years ago

Hi I need help for a question here related to Circle as attached below. Please help Thanks! ><"

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  1. rinoa1989
    • 3 years ago
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    The answer given is A

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  2. hartnn
    • 3 years ago
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    do you know the central angle and corresponding arc property ...like |dw:1359727764547:dw| if central angle given is 70 degrees ,say, then can you find length of arc p and angle q ?

  3. hartnn
    • 3 years ago
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    i meant length of arc q and angle p...

  4. amistre64
    • 3 years ago
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    you can create isocolese triangles from central angles.|dw:1359728013730:dw|

  5. hartnn
    • 3 years ago
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    for your question, i extended WO to meet circle at say L |dw:1359727980102:dw|

  6. amistre64
    • 3 years ago
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    i think working the iso triangle with the 65 would be simpler :)

  7. amistre64
    • 3 years ago
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    |dw:1359728146814:dw|

  8. hartnn
    • 3 years ago
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    oh, but i figured it out the using other method, i think..and i donno how that would help...maybe you can proceed to show us...

  9. rinoa1989
    • 3 years ago
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    omg looks so complicated! LOL ><"

  10. amistre64
    • 3 years ago
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    the base angles of an iso tri are equal; leaving the central angle to be 180 - 2base; in this case, 180 - 2(65) total arc length is then 70 + 180 - 2base and x is determined to be half that

  11. hartnn
    • 3 years ago
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    yeah...i figured arc WV = 50 using similar thing, which is essentially similar to what u did..

  12. hartnn
    • 3 years ago
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    my way... arc WV+VU+UL = 180 but since angle LWV = 65 , VU+UL = 130 which gives WV = 50 then 2x = 70 +WV

  13. hartnn
    • 3 years ago
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    ask if any doubts...

  14. rinoa1989
    • 3 years ago
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    wait let me digest first lol

  15. rinoa1989
    • 3 years ago
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    i duno how u get this arc WV+VU+UL = 180

  16. hartnn
    • 3 years ago
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    since is O the centre, arc WL is semicircle WL = 180 WV+VU+UL = 180

  17. rinoa1989
    • 3 years ago
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    ic ok how bout this one 2x = 70 +WV ??

  18. hartnn
    • 3 years ago
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    |dw:1359729747346:dw| so 2x = 70+WV

  19. hartnn
    • 3 years ago
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    thats why i first asked you whether you know that property....

  20. hartnn
    • 3 years ago
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    still don't get it ?

  21. rinoa1989
    • 3 years ago
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    sorry i duno about that property i tot it is related to the photo i attach here

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  22. hartnn
    • 3 years ago
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    its the same property i illustrated.. angle A = x= 1/2 of central angle O(2x) = 1/2 of arc QP so, here x = half of arc TV x= TV/2 2x=TV = 70+WV....

  23. rinoa1989
    • 3 years ago
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    oops ic ok! coz i just use the 70 to divide 2 to find x now i understand thank you so much for your time in explaining! ><"

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