Question

moderator challenge only

Answer 1

let the unknown angles be 2x,4x,6x
the angle sum property of triangle =
2x+4x+6x=180°
12x=180°
x=180°/12
x=15°
the unknown angles are 2*15=30°,4*15=60°,6*15=90°

Answer 2

hope it helps...........