Question

Help,12345678901234567890

Answer 1

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°