Match each number with its correct letter according to the picture
1. Ray ST is perpendicular to Ray SR.
a) Substitution
2. ∠RST is a right angle.
b) Subtraction property of equality
3. m∠RST = 90°
c) Definition of perpendicular lines
4. m∠1 + m∠2 = m∠RST
d) Angle addition theorem
5. m∠1 + m∠2 = 90°
e) Definition of right angle
6. m∠1 = 90° - m∠2
f) Given
