57.5°
complementary angles sum to 90°
let x represent the large angle then the smaller angle = x - 25 thus
x + x - 25 = 90
2x - 25 = 90
add 25 to both sides
2x = 90 + 25 = 115
divide both sides by 2
x =
= 57.5
larger angle = 57.5° and smaller angle = 57.5° - 25 = 32.5°
note 57.7 + 32.5 = 90