Measure of the smaller angle = 25
Complementary angles sums up to 90°.
let
measure of the smaller angle = x
measure of bigger angle = 15 + 2x
Therefore,
15 + 2x + x = 90°
15 + 3x = 90°
90 - 15 = 3x
75 = 3x
x = 75 / 3
x = 25
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