Angles of a triangle in a given ratio: find the angles

1. A.
   $20^\circ$
2. B.
   $40^\circ$
3. C.
   $50^\circ$
4. D.
   $60^\circ$

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1. A.
   $1 : 2 : 3$
2. B.
   $3 : 4 : 5$
3. C.
   $5 : 6 : 7$
4. D.
   $6 : 7 : 8$

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1. A.
   $90^\circ$
2. B.
   $120^\circ$
3. C.
   $135^\circ$
4. D.
   $150^\circ$

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