IS Properties of Triangles

equilateral ∆ ⇔

⇔ ∆ with 3 ≅ sides

isosceles ∆ ⇔

⇔ ∆ with at least 2 ≅ sides

scalene ∆ ⇔

⇔ ∆ with no ≅ sides

acute ∆ ⇔

⇔ ∆ with 3 acute ∠'s

right ∆ ⇔

⇔ ∆ with 1 right ∠

obtuse ∆ ⇔

⇔ ∆ with 1 obtuse ∠

equiangular ∆ ⇔

⇔ ∆ with 3 ≅ ∠'s

sum of ∠ measures in ∆ ⇒

180°

Acute ∠'s of right ∆ ⇒

complementary

in a ∆, 2 ≅ sides ⇒

opposite ∠'s ≅

in a ∆, 2 ≅ ∠'s ⇒

opposite sides ≅

equilateral ∆ ⇔

⇔ equiangular ∆

altitude ⇒

⊥ lines

median ⇒

midpoint