Using the calculator to find angles

// trigonometry lesson #4

helloooo, this lesson you will be learning about finding angles and using a calculator to help you find the angle (:



let's get into it..

this is the calculator we recommend for this lesson ( fx82au PLUS)

to find an angle of a triangle, use inverse sine, cosine and tangent. press shift sin, cos and tan.

Finding an angle:
Example:
sin θ = 0.85
sin (sin θ) = sin-1 (0.85) 

Solution:
Enter Shift sin 0.85 into the calculator
= 58.21
= press [bubbles] = 58.2 (degrees) 

judy, hannah & paul