Question

Find the value of cos 30 geometrically

Answer 1

Please take a look at the attached diagram, since angle CAB is 30° CA = 2cm and BC = 1cm. By Pythagoras Theorem, we can calculate AB as follows:

CA² = AB² + BC²
2² = AB² + 1²
Hence AB = √3

Now cos∅ = base ÷ hypotenuse

Therefore cos30° = (√3)/2

Answer 2

hope it would help you