CH - 1 INTRODUCTION TO TRIGONOMETRY

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Across
  1. 4. Trigonometry is the branch of mathematics that studies the relationship between the sides and angles of a right-angled triangle.
  2. 10. – Trigonometric identities are equations that are true for all values of the angle where they are defined.
  3. 12. Trigonometry is used to find unknown sides and angles in right-angled triangles.
  4. 13. Sine, cosine, tangent, cosecant, secant, and cotangent are called trigonometric ratios.
  5. 14. The side adjacent to the given angle, other than the hypotenuse, is called the base.
  6. 16. – The reciprocal of tangent is called cotangent.
Down
  1. 1. – Two angles whose sum is 90° are called complementary angles.
  2. 2. The trigonometric ratios of standard angles 0°, 30°, 45°, 60°, and 90° have fixed values.
  3. 3. The side opposite the right angle is called the hypotenuse.
  4. 5. A triangle having one angle equal to 90° is called a right-angled triangle.
  5. 6. The ratio of the base to the hypotenuse is called the cosine of an angle.
  6. 7. The ratio of the perpendicular to the hypotenuse is called the sine of an angle.
  7. 8. The reciprocal of sine is called cosecant.
  8. 9. The side opposite the given angle is called the perpendicular.
  9. 11. The ratio of the perpendicular to the base is called the tangent of an angle.
  10. 15. The reciprocal of cosine is called secant.