en.wikipedia.org/wiki/Isosceles_triangle

The theorem which states that the base angles of an isosceles triangle are equal appears as Proposition I.5 in ...

www.varsitytutors.com/hotmath/hotmath_help/topics/isosceles-triangle-theorem

Isosceles Triangle Theorem. If two sides of a triangle are congruent , then the angles opposite to these sides are congruent. ∠ P ≅ ∠ Q. Proof: Let S be the ...

www.mathwarehouse.com/geometry/congruent_triangles/isosceles-triangle-theorems-proofs.php

Proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal ...

www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-congruence-theorems/v/congruent-legs-and-base-angles-of-isosceles-triangles

Sal proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are ... They are all theorems.

brilliant.org/wiki/isosceles-triangle-theorem

An isosceles triangle is a triangle that has two equal sides. The isosceles triangle theorem states the following: This theorem gives an equivalence relation.

mathbitsnotebook.com/Geometry/SegmentsAnglesTriangles/SATIsosceles.html

definition. An isosceles triangle is a triangle with two congruent sides. ... Theorem : isos1 isos3. Converse: isos2 isos4 ... The base angles of an isosceles triangle

mathworld.wolfram.com/IsoscelesTriangle.html

An isosceles triangle is a triangle with (at least) two equal sides. ... of the isosceles triangle illustrated above can be found from the Pythagorean theorem as ...