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eroshea

From point A 10cm from a plane P, a perpendicular line AC is drawn passing through a circle with canter C and radius of 8 cm in the plane. At any point B on this circle, a tangent BD is drawn 18cm in length. FInd the distance from A to D. ----> i need the illustration

  • one year ago
  • one year ago

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  1. Shadowys
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    |dw:1353418479537:dw|

    • one year ago
  2. eroshea
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    how can i solve this one?

    • one year ago
  3. Shadowys
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    well, you'll need to find CD. to do that, note that BDC is a right angle triangle.

    • one year ago
  4. eroshea
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    how does it became a right triangle?

    • one year ago
  5. Shadowys
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    CB and BD are given. so this calls for pythagoras theorem. Then also note that ADC is also a right angle triangle. AC is given, CD is found.

    • one year ago
  6. Shadowys
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    Well, since it is a tangent, tangents always meet the circle at right angles.

    • one year ago
  7. eroshea
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    |dw:1353476601742:dw| so the answer for AD is 22.1 cm??

    • one year ago
  8. Shadowys
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    yh. lol you've got it!

    • one year ago
  9. eroshea
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    thanks :))

    • one year ago
  10. Shadowys
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    you're welcome :)

    • one year ago
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