What are the mathematical formulas for grade three? - Training Enrollment Network

What are the mathematical formulas for grade three?

The mathematical formula of Grade Three is as follows:

1 and each inner angle of a regular n-polygon is equal to (n-2)180/n.

2. Basic nature of proportion: if a:b=c:d, then ad=bc If AD = BC, then A: B = C: D.

3、tanA = cot(90-A)= cotB； cotA=tan(90 -A)=tanB .

4.S cylindrical edge: S edge +S bottom =2πrh+2πr? .

5.s cycle =πr? .

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