If α,β,r are direction angles of a line and a = 60°, B = 45° then r = (a) 30° or 90° (b) 45° or 60° (c) 90° or 30° (d) 60° or 120°

If α,β,r are direction angles of a line and a = 60°, B = 45° then

1.	If α,β,r are direction angles of a line and a = 60°, B = 45° then r = (a) 30° or 90° (b) 45° or 60° (c) 90° or 30° (d) 60° or 120°
Answer» LINE is ALWAYS 180°a+b+r=180°60+45+r=180105+r=180r=180-105r=75°

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If α,β,r are direction angles of a line and a = 60°, B = 45° then r = (a) 30° or 90° (b) 45° or 60° (c) 90° or 30° (d) 60° or 120°​

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If α,β,r are direction angles of a line and a = 60°, B = 45° then r = (a) 30° or 90° (b) 45° or 60° (c) 90° or 30° (d) 60° or 120°