In this parallelogram, the measure of

∠ A = 60°

Step-by-step explanation:

Consecutive angles in a parallelogram sum to 180° , then

∠ A + ∠ B = 180° ( substitute ∠ B = 2 ∠ A )

∠ A + 2 ∠ A = 180°

3 ∠ A = 180° ( divide both sides by 3 )

∠ A = 60°

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)

yes. we do proportions in probabilities.