What is the general form of the equation of a circle with center at (a, b) and radius of length m? . a. x2 + y2 − 2ax − 2by + (a2 + b2 − m2) = 0 . b. x2 + y2 + 2ax + 2by + (a2 + b2 − m2) = 0. c. x2 + y2 − 2ax − 2by + (a + b − m2) = 0. d. x2 + y2 + 2ax + 2by + a2 + b2 = -m2.

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.

Select the two pairs of figures that are similar.

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8