In the right triangle ABC, AB is 12 ft and AC is 13 ft. What is the length of BC? A.5 ft.
B.11 ft.
C.18 ft.
D.25 ft.

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

What dimensions can créate more than one triangle ?

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.