If the end of a 11-inch pendulum travels 7.78 inches, to the near east whole degree, determine the angle of rotation.

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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.

What is the circumference of a circle with an area of 50.24 cm²?