Identify the flowchart proof for the two-column proof. Given: m∠PQR=90°
and m∠b=5·m∠a

Prove: m∠a

Two-Column Proof
1. m∠PQR=90°
, m∠b=5·m∠a (Given)
2. m∠a+m∠b=m∠PQR (∠s Add. Post.)
3. m∠a+5·m∠a=90°(Subst. Prop. of = )
4. 6⋅m∠a=90° (Simplify.)
5. m∠a=15° (Div. Prop. of = )