Which sequence of transformations proves that shape I is similar to shape II A. a 90° counterclockwise rotation about the origin, and then a dilation by a scale factor of 2

B. a reflection across the x-axis, and then a dilation by a scale factor of 3

C. a reflection across the x-axis, and then a dilation by a scale factor of 2

D. a 90° counterclockwise rotation about the origin, and then a dilation by a scale factor of 3

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.