rinoa1989
Hi need help for question related to circle as drawing below thanks! answer given is 30
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rinoa1989
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|dw:1359828448012:dw|
rinoa1989
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sorry forget label RS=2PQ. Find X
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a triangle made like this i mean in semicircle every triangle made is a right angled triangle.
this means the given triangles are right angled triangle
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considering one with 20 degrees we get
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|dw:1359828672943:dw|
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clear up to this point???
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this is not that x you mentioned in your queston
rinoa1989
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yes so wat's next??
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|dw:1359828871406:dw|
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|dw:1359829032068:dw|
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can you find PQ ???
rinoa1989
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20??
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how??
rinoa1989
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= = i not sure >< because the angle at RS is 40?? so 40/2??
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no no the angles here are 20-70-90 respectively
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i m talking about the lenght of PQ
rinoa1989
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i duno how to find >< should be 20 because the angle at S is 20
ZakaullahUET
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|dw:1359830647922:dw|
ZakaullahUET
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since RS is double of PQ, the angle opposite to RS is double the angle opposite to PQ
thus theta=2*20=40
ZakaullahUET
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|dw:1359830828420:dw|
ZakaullahUET
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now look at triangle PQS
|dw:1359830874348:dw|
ZakaullahUET
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so the figure is improved
|dw:1359830962646:dw|
compare with ur answer
rinoa1989
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I understand now!!thanks!! ^^