Question 8(Multiple Choice Worth 1 points) (01.06 MC)
A
D
20°
B
C
If m_ABC = 80°, what is m DBC? Justify your reasoning.
Using the Angle Addition Postulate, 20+ m_DBC = 80. So, m_DBC = 60° using the subtraction property of equality.
Using the Angle Addition Postulate, 20 + 80 = m_DBC. So, m DBC = 100° using the addition property of equality.
Using the addition property of equality, 20 + 80 = 100, so m DBC = 100°.
Using the subtraction property of equality, 80 - 20 = 60, so m DBC = 60°