algebra precalculus - Using unit circle to explain $\cos(0) = 1

We have been taught $\cos(0) = 1$ and $\sin(90) = 1$. But, how do I visualize these angles on the unit circle?

Unit Circle - Wyzant Lessons

Honors Pre-Calculus] I have a quiz on “Evaluating Trigonometric Values and the Unit Circle” tomorrow and this still hasn't clicked with me! : r/HomeworkHelp

5.2: Unit Circle - Sine and Cosine Functions - Mathematics LibreTexts

Solved Use the unit circle to find all of the exact value(s)

Unit Circle

Angles and the Unit Circle – Math Hints

How do you find the exact value of sin(0)?

PPT - The Unit Circle PowerPoint Presentation, free download - ID:703020

10.2: The Unit Circle - Cosine and Sine - Mathematics LibreTexts