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The answers ar cos A=sin C and sin A= cos (90°-A)

For the given right angle triangle ABC  (A) option is the correct answer.

What is right angle triangle in trigonometry ?

A right triangle, also known as a right-angled triangle, or more technically an orthogonal triangle, was originally known as a triangle, is a triangle with one right angle and two perpendicular sides. Trigonometry is based on the relationship between the sides and various angles of a right triangle.

What is the correct statement for right triangle ABC ?

  • Cos A = Sin ( 90˚- A )
  • Since at 90˚ Sine function convert into cosine function and (90˚- A) results in first quadrant where sine function is positive.
  • Therefore Cos A = Cos A

Hence the correct option is (a) option Cos A = Sin ( 90˚- A )

Learn more about the right angle triangle in trigonometry at

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