how do I find out the circumference &/or area of a circle? like, not just the formula, but like, an explanation and each step on the matter, then the formula. thanks. Also, an example would be awesome

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music. they were asked how they like three types of music: rock, country western and jazz. the results are summarized below: no one dislikes all three types of music. six like all three types of music. eleven don’t like country western. sixteen like jazz. three like country western and jazz, but not rock. six don’t like rock. eight like rock and country western. seven don’t like jazz. how many students were surveyed?

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set