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In a A B C ,\ /B=105^0,\ /C=50^0, Find ...

In a ` A B C ,\ /_B=105^0,\ /_C=50^0,` Find `/_A`

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Sum of angles of a triangle is `=180@
a+b+c=180@`
`a^@+105^@+50^@-180^@`
`=a^@+155^@=180^@`
`a=180^@-155^@`
`a=25^@`
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RD SHARMA-TRIANGLE AND ITS ANGLES-All Questions
  1. In a A B C ,\ /B=105^0,\ /C=50^0, Find /A

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  2. The sum of two angles of a triangle is equal to its third angle. De...

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  3. Of the three angles of a triangle, one is twice the smallest and an...

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  4. If the angle of a triangle are in the ratio 2:3:4, determine three ...

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  5. The sum of two angles of a triangle is 80^0 and their difference is...

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  6. In a A B C , if 2/A=3/b=6\ /c , determine /A ,\ /B\ a n d\ /C

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  7. A , B , C are the three angles of a triangle. If A-B=15^@,\ B-C=30^@...

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  8. In Figure, A B D C . If x=(4y)/3a n d\ y=(3z)/8, find /B C D ,\ /A B ...

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  9. A triangle A B C is right angles at AdotA L is drawn perpendicular ...

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  10. In Figure P S\ is the bisector of /Q P R\ a n d\ P T\ |Q R . Show tha...

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  11. If two parallel lines are intersected by a transversal, prove that ...

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  12. In Figure, T Q\ a n d\ T R are the bisectors of /Q\ a n d\ /R respecti...

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  13. In Figure, m\ and\ n are two plane mirrors perpendicular to each oth...

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  14. In A B C ,\ /B=45^0,\ /C=55^0 and bisector of /A meets B C at a point...

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  15. A ,B ,C , are three angles of a triangle. If A-B=15^@,B-C=30^@, find /...

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  16. In a A B C , if /A=55^0,\ /B=40^0, find /C

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  17. If the angles of a triangle are in the ratio 1:2:3, determine three...

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  18. The angles of a triangle are (x-40)^0,\ (x-20)^0\ a n d\ (1/2x-10)^...

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  19. The angle of a triangle are arranged in ascending order of magnitud...

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  20. Two angles of a triangle are equal and the third angle is greater t...

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