## rinoa1989 2 years ago Hi need help for question related to circle as drawing below thanks! answer given is 30

1. rinoa1989

|dw:1359828448012:dw|

2. rinoa1989

|dw:1359828461353:dw| sorry forget label RS=2PQ. Find X

3. 03453660

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

4. 03453660

considering one with 20 degrees we get

5. 03453660

|dw:1359828672943:dw|

6. 03453660

clear up to this point???

7. 03453660

this is not that x you mentioned in your queston

8. rinoa1989

yes so wat's next??

9. 03453660

|dw:1359828871406:dw|

10. 03453660

|dw:1359829032068:dw|

11. 03453660

can you find PQ ???

12. rinoa1989

20??

13. 03453660

how??

14. rinoa1989

= = i not sure >< because the angle at RS is 40?? so 40/2??

15. 03453660

no no the angles here are 20-70-90 respectively

16. 03453660

i m talking about the lenght of PQ

17. rinoa1989

i duno how to find >< should be 20 because the angle at S is 20

18. ZakaullahUET

|dw:1359830647922:dw|

19. ZakaullahUET

|dw:1359830742128:dw| since RS is double of PQ, the angle opposite to RS is double the angle opposite to PQ thus theta=2*20=40

20. ZakaullahUET

|dw:1359830828420:dw|

21. ZakaullahUET

now look at triangle PQS |dw:1359830874348:dw|

22. ZakaullahUET

so the figure is improved |dw:1359830962646:dw| compare with ur answer

23. rinoa1989

I understand now!!thanks!! ^^