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If sin A = 3/5 in a right triangle, what is cos A?

medium MCQ Class 10 · Mathematics · Some Applications of Trigonometry
  1. 4/5
  2. 5/3
  3. 3/4
  4. 4/3
Answer
4/5

The correct answer is 4/5 — cos A = Adjacent / Hypotenuse = 4/5.

Step-by-step solution

  1. Adjacent² = Hypotenuse² - Opposite² = 5² - 3² = 16 ⇒ Adjacent = 4.
  2. cos A = Adjacent / Hypotenuse = 4/5.

Concept tested: Trigonometric Ratios

Published · How this solution was prepared and checked

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