Final answer:
In triangle PQR, angles P and R each measure 45 degrees, and angle Q measures 90 degrees.
Step-by-step explanation:
To find the measure of each angle in triangle PQR, where angle P is congruent to angle R and the measure of angle Q is twice the measure of angle R, we can use the fact that the sum of the angles in any triangle is 180 degrees.
Let's denote the measure of angle R as x. Because angle P is congruent to angle R, the measure of angle P is also x. According to the problem, the measure of angle Q is twice that of angle R, so it is 2x. Now, we can create an equation representing the sum of the angles:
x + x + 2x = 180
Combining like terms, we have:
4x = 180
Dividing both sides by 4 to solve for x:
x = 45
Now that we have the measure of angle R, we can find the measures of angles P and Q:
Angle P = x = 45 degrees
Angle R = x = 45 degrees
Angle Q = 2x = 90 degrees
Therefore, in triangle PQR, angles P and R each measure 45 degrees, and angle Q measures 90 degrees.