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Triangle theorems: SATT, EAT, ITT

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Learn it SATT: angles in a triangle add to 180°. EAT: an exterior angle equals the sum of the two opposite interior angles. ITT: the base angles of an isosceles triangle are equal.

Example: In isosceles triangle ABC (AB = AC), ∠A = 40°. Find ∠B.

  1. ITT: ∠B = ∠C.
  2. SATT: $40 + 2\angle B = 180$.
  3. $\angle B = 70°$.

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