Help. i can't find the answer anywhere and i hate doing slope

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle

When solving a logarithm equation, how do you find the missing variable ?