D
Statements
1. ZBOC and ZCOD are complementary angles;
Reasons
1. given
BO intersects AD at point O
2 m/BOC + m/COD = 90°
3 m/BOD= 90°
4. ZAOB and ZBOD are supplementary angles 4. linear pair theorem
5 m/AOB + m/BOD = 180°
6 m/AOB+90° 180°
7. m/AOB = 90°
8 m/AOB = m/BOD
9 ZAOB
BOD
2. definition of complementary angles
3. substitution property of equality
5. definition of supplementary angles
6. substitution property of equality
7. subtraction property of equality
8. substitution property of equality
9. definition of congruent angles
There is a step missing in the proof. Identify where in the proof there is a missing step and what this ston
