Triangle DEF is given by the points D(1, 1), E(3, 8), and F(8,0). Select True or False for each statement.

A. The area of ADEF is 25.5 square units.

B. ADEF is a scalene triangle.

C. The area of ADEF Is 30 units.

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.