Question 9 of 15 The surface area of a cylinder is 351.68. If the dimensions of the cylinder are
halved, what is the surface area of the new cylinder?
A. 5.495
B. 5626.88
C. 87.92
D. 21.98
SUBMIT

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.