In triangle ABC, sides and are congruent. If the measure of angle C is 40°, what is the measure of angle A?

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In triangle <em>ABC</em>, sides <img alt='images' src='https://www.fatskills.com/images3/gmat/c0396-01.jpg'/> and <img alt='images' src='https://www.fatskills.com/images3/gmat/c0396-02.jpg'/> are congruent. If the measure of angle <em>C</em> is 40°, what is the measure of angle <em>A</em>?