# A student writes an incorrect step while checking if the sum of the measures of the two re

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Algebra
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Question description

Step 1: m∠e + m∠f + m∠g = 180° (sum of angles of a triangle)
Step 2: m∠h − m∠g = 90° (corresponding angles)
Step 3: Therefore, m∠e + m∠f + m∠g = m∠g + m∠h
Step 4: So, m∠e + m∠f = m∠h

In which step did the student first make a mistake and how can it be corrected?

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