500
Use the clues to find the angle measures of the following triangle: The second angle is double the measure of the first angle. The third angle is the sum of the other two angle measures. What are the measure of the triangle's three angles?
a. 35 degrees, 70, degrees, 105 degrees
b. 30 degrees, 60 degrees, 90 degrees
c. 20 degrees, 40 degrees, 60 degrees
d. 45 degrees, 90 degrees, 135 degrees
What is b. 30 degrees, 60 degrees, 90 degrees?