Complementary Angles Calculator

Your details

The angle whose complement you want to find. Must be between 0 and 90 degrees (0 and pi/2 radians).
deg
Complementary Angle
55

The angle that, when added to Angle A, equals 90 degrees (pi/2 radians)

Complement55 deg (0.959931 rad)
sin(A) = cos(B)0.573576
cos(A) = sin(B)0.819152
tan(A) = cot(B)0.700208

The complement of 35 deg is 55 deg.

  • Angle A is 35 deg and its complement is 55 deg. Together they form a right angle (90 deg).
  • Angle A (35 deg) is smaller, so its complement (55 deg) is larger.
  • In a right triangle, the two acute angles are always complementary. If one acute angle is 35 deg, the other is 55 deg.
  • The cofunction identities mean sin(A) = cos(B) and tan(A) = cot(B) whenever A and B are complementary - that is where the prefix "co-" in cosine, cotangent, and cosecant comes from.

Next stepUse the trig cofunction values below to see how sin, cos, tan, cot, sec, and csc relate for this complementary pair.

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