Angie and becky each completed a separate proof to show that the measures of vertical angles akg and hkb are equal. who completed the proof incorrectly? explain. line ab intersecting line gh at k angie's proof statement justification 1. segment gh intersects segment ab at k 1. given 2. m∠akg + m∠gkb = 180° m∠gkb + m∠hkb = 180° 2. definition of supplementary angles 3. m∠akg + m∠ gkb = m∠gkb + m∠hkb 3. substitution property 4. m∠akg = m∠hkb 4. subtraction property becky's proof statement justification 1. segment gh intersects segment ab at k 1. given 2. m∠akg + m∠gkb = 180° m∠gkb + m∠hkb = 180° 2. angle addition postulate 3. m∠akg + m∠ gkb = m∠gkb + m∠hkb 3. substitution property 4. m∠akg = m∠hkb 4. subtraction property