What is the process of solving 39580 x 10

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Someone me what is the area of this figure? 18m 18m 8m 16m

If value of cos330° is √3/2 then find tan165°.