Apothem in Triangles Shown

Please explain how to find the apothem, especially in regards to 45-45-90 and 30-60-90 triangles.

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...in my math class are reakky smart and I don't feel comfortable asking alot of questions its about find the apathem of a circle and i have trouble remembering the formulas for 45 45 90, and 30 60 90 degree triangles

Solution:

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Given a circle, ...