A triangle is rotated 90° about the origin. Which rule describes the transformation? ООО
(x, y) - (-X, -y)
O (x, y) - (-), x)
(x, y) - (-y, -)
(x, y) - (y, -x)
Help?

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.