What is m∠ABC? Justify your reasoning.
Using the addition property of equality, 40 + 15 = 55,...
What is m∠ABC? Justify your reasoning.
Using the addition property of equality, 40 + 15 = 55, so m∠ABC = 55°.
Using the subtraction property of equality, 40 − 15 = 25, so m∠ABC = 25°.
Using the Angle Addition Postulate, 15 + m∠ABC = 40. So, m∠ABC = 25° using the subtraction property of equality.
Using the Angle Addition Postulate, 15 + 40 = m∠ABC. So, m∠ABC = 55° after simplifying.
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