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Asma Afzal from DELHI PUBLIC SCHOOL, asked a question
Subject: Math , asked on 5/12/11

From a point P, two tangents PA and PB are drawn to a circle with centre O. If OP is equal to the diameter of the circle, prove that triangle ABC is equilateral..

 

i really need the answer..my exams are starting tomorrow..

Bhavana Hegde From Vidhya Ashram, added an answer, on 5/12/11
27 helpful votes in Math

  pleez..............

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Bhavana Hegde From Vidhya Ashram, added an answer, on 5/12/11
27 helpful votes in Math

 Sorry the diagram is not coming...

Hope whatever I've  Answered will help you..

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Bhavana Hegde From Vidhya Ashram, added an answer, on 5/12/11
27 helpful votes in Math

 

If your question is to show that triangle ABP is equilateral,

Let m be the mid-point of OP .i.e., M lies on the circle. (Since OP is equal to the diameter).

OM =OA

 

In triangle AOP,

|A =900

M is the midpoint of the hypotenuse.

=> OA = OM = AM (Mid-point of the hypotenuse is equidistant from all the vertices).

In triangle AOM,

OA = OM =AM.

=> AOM is equilateral triangle.

|AOM =600

 

In triangle APB,

|AOM =600

 

|AOP + |OAP + |APO = 1800

600 + 900 + |APO = 1800

  |APO = 1800 – 1500

  |APO = 300

|APB = 2|APO

|APB = 600

 

In APB,

 AP = BP

|APB = 600

=> APB is an equilateral triangle.

 

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Asma Afzal From Delhi Public School, added an answer, on 9/12/11

 sorry...it was ABP!

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Asma Afzal From Delhi Public School, added an answer, on 9/12/11

thanx for yor help.. ;)

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Navin Saxena From Gic Bareilly, added an answer, on 5/12/11
159 helpful votes in Math

now what is "c" point in your question, is not explained.

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