Isosceles and Equilateral Triangles
This page focuses on the special properties of isosceles and equilateral triangles, which are essential components of Açı Kenar Bağıntıları Konu Anlatımı (angle-side relations topic explanation).
Definition: An isosceles triangle has two equal sides and two equal angles opposite those sides.
Key properties of isosceles triangles:
- The base angles are equal
- The altitude to the base is also the angle bisector and median
- The triangle has a line of symmetry through the vertex angle
Example: A problem is presented involving an isosceles triangle ABC where AB = AC, and angles ABE = ACB. Students are asked to find the length of ED.
Highlight: Equilateral triangles are introduced as a special case of isosceles triangles where all sides and angles are equal.
Understanding these special triangles is crucial for solving more complex geometric problems and is a key part of the 9th-grade mathematics curriculum.