HTKM is shown. Given: ∠ M is supplementary ± circ ∠ K.∠ K is supplementary to ∠ T. ∠ T is supplementary to ∠ H and ∠ H is supplementary to ∠ M. Prove: HTKM is a parallelogram. An incomplete flowchart proof is shown. M is supplementary to ∠ K, ∠ K is supplementary to ∠ T, ∠ T is supplementary to ∠ H_1 and Statement 1 LN is supplementary to ∠ M Given Reason 1 HTKM is a parallelogram Definition of parallelogram What is Reason 1?