I did this question on determining trigonometry ratios using a point on a terminal arm. But when I calculated it I got the wrong answer because I used the wrong points.

How do you know which points to use on the graph after using a protractor to measure the angle?

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

if i did my math right then the answer should but 108