Find the measure of the angle find the measure of the angle. n = __ °

Right triangle
so
n + n + 40 = 90
2n = 50
  n = 25

answer
Measure of angle n = 25°

The 3 angles in a triangle need to equal 180 degrees.
 the square in the top right means it is a right triangle and that angle = 90 degrees.
 The other 2 angles then need to equal 180-90 = 90 degrees.

Now we have n + (n+40) = 90
 Remove the parenthesis and add the 2 n's

2n + 40 = 90

Subtract 40 from each side:

2n = 50

Divide both sides by 2:

n = 50/2 = 25 degrees

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