Basic Concepts of Trigonometry

Who is the father of trigonometry?

• Euclid

• Pythagoras

• Hipparchus

• Archimedes

Trigonometry is related to ...

• Right triangle

• Unit circle

• Both

How many main trigonometric functions are there?

• 4

• 5

• 6

• 12

Trigonometric functions are periodic.

• True

• False

sine is equal to ...

• opposite/adjacent

• opposite/hypotenuse

• adjacent/opposite

• adjacent/hypotenuse

Cotangent is equal to...

• opposite/adjacent

• adjacent/hypotenuse

• opposite/hypotenuse

• adjacent/opposite

Let 0<A<180. In which values of A the cosine is equal to zero?

(a)  

sin30=? & cos30?

• √3 & 1/2

• 1 & √3

• 1/2 & √3/2

• √3/2 & 1/2

sin 60=? & cos 60= ?

• √3 &1/2

• √3/2 &1/2

• 1/2 & 2/√3

• 1/2 & √3/2

Which equation shows the correct relationship?

• sin C= 4/5

• cos C= 3/5

• tan A= 3/4

• sin A= 4/5