Respuesta :

mhanifa

Answer:

Useful for this exercise:

  • Sum of interior angles of a triangle is 180°
  • Straight angle is 180°
  • Angle addition postulate

Finding missing angles:

  • m∠1 = 180° - (57° + 72°) = 51°
  • m∠2 = 90° - 72° = 18°
  • m∠3 = 180° - 57° = 123°
  • m∠4 = 180° - (18° + 123°) = 39°
MisterBrainly

#1

Use angle sum property

m<1

  • 180-72-57
  • 51°

#2

Angles are complementary

m<2

  • 90-72
  • 18°

#3.

Angles are supplementary

m<3

  • 180-57
  • 123°

#4.

Use angle sum property

m<4

  • 180-123-18
  • 39°

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