Theorem sq3

Description: The square of 3 is 9. (Contributed by NM, 26-Apr-2006)

	Ref	Expression
Assertion	sq3	$$⊢3^2=9$$

Proof

Step	Hyp	Ref	Expression
1		3cn	$$⊢3\in ℂ$$
2	1	sqvali	$$⊢3^2=3\cdot 3$$
3		3t3e9	$$⊢3\cdot 3=9$$
4	2 3	eqtri	$$⊢3^2=9$$