Asquare is shown below. which expression can be used to find the area, in square units, of the shaded triangle in the square? a square with a side length of 6 units is shown. a diagonal is drawn with one section shaded inside the figure. fraction 1 over 4 ⋅ 6 ⋅ 6 fraction 1 over 2 ⋅ 3 ⋅ 3 fraction 1 over 4 ⋅ 3 ⋅ 3 fraction 1 over 2 ⋅ 6 ⋅ 6

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.