👉 Learn how to prove that two triangles are congruent. Two or more triangles are said to be congruent if they have the same shape and size. There are many postulates and theorems to determine whether ...

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👉 Learn how to write a proof given a triangle. A triangle is a polygon with three sides. A proof is a series of statements and reasons that establishes the truth of a mathematical claim (statement).

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-- Exercise: replace the words "sorry" with the correct Lean justification. example {r s : ℚ} (h1 : s + 3 ≥ r) (h2 : s + r ≤ 3) : r ≤ 3 := -- Example 1.4.3 -- Exercise: type out the whole proof ...