What is the least common denominator of 1/3 and 5/6

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)