find the complement of the following. 75degree , 40degree , 20degree , 63degree , 38degree?

Answer 1

Complementary angles add to 90 degrees.

Just subtract your angles from 90.

ie. 90 - 75 = 15
therefore 15 is the complement to 75

Answer 2

Complementart angles equal 90 degrees

The complement of

90° - 75° = 15°

90° - 40° = 50°

90° - 20° = 70°

90° - 63° = 27°

90° - 38° = 52°

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Answer 3

Complementary angles are those that add up to 90 degrees. To find the complementary angle, just subtract the angle you know from 90.

75. 90-75= 15 degrees

40. 90-40 = 50 degrees

20. 90-20 = 70 degrees

63. 90-63 = 27 degrees

38. 90-38 = 52 degrees

Answer 4

Complementary angles are found by taking the angle from 90.

If the angle is x, then its complement is 90-x (in degrees).

Complements are very useful in trigonometry:

sin(x) = cos(90-x)
cos(x) = sin(90-x)
tan(x) = cot(90-x)

Complements are used extensively in spherical trigonometry, notably is geodesy and astronomy:
e.g.,
Altitude = 90 - zenith distance
polar distance = 90 - declination or 90 - latitude

PS: You do not have this case in your questions, but you should know that bigger angles can still have complements:

if x = 120 degrees, then its complement (90-x) is -30 degrees. For example, if you calculate the zenith distance of a star to be 120 degrees, it means that the star is 30 degrees below the horizon.

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Another important word is the "supplement" 180-x

Answer 5

Complementary angles add up to 90. Subtract your angle to find its complement 90 - 75 = 15......