let angle 2 = x.
the measure of angle 1 is therefore equal to 2x - 15
presumably the 2 angles are the angles that the flag makes with the ground.
the sum of the angles is therefore equal to 180 degrees.
you get:
x + 2x - 15 = 180
simplify to get:
3x - 15 = 180
add 15 to both sides to get:
3x - 195
divide both sides by 3 to get:
x = 65
2x-15 = 115
115 + 65 = 180
all the numbers check out;.
one of the angles is 65 degrees.
the other angle is 115 degrees.
the 115 degree angle is equal to 2 times 65 - 15 = 130 - 15 = 115.
if you look at the picture in the memorial, that looks about right.
see below:
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