ABCD este un trapez, diagonalele AC și BD se intersectează în punctul O, AO=4 cm, OB=5 cm, AB=6 cm, AC=12cm. Aflați perimetrul triunghiului DOC. *

Identify the number as a rational or irrational. explain. 127

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.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a