If none of the sides of a triangle are equal (of equal length), the triangle is scalene. If two or more of the triangles sides are equal, the triangle is isosceles.
How can we prove a triangle?
The simplest way to prove that triangles are congruent is to prove that all three sides of the triangle are congruent. When all the sides of two triangles are congruent, the angles of those triangles must also be congruent. This method is called side-side-side, or SSS for short.
How do you prove a triangle?
If two sides are the same length, then it is an isosceles triangle. If all three sides are the same length, then it is an equilateral triangle. When classifying a triangle by its angles, you should look at the size of the angles. If there is a right angle, then it is a right triangle.
What are the 3 ways to prove triangles are similar?
These three theorems, known as Angle – Angle (AA), Side – Angle – Side (SAS), and Side – Side – Side (SSS), are foolproof methods for determining similarity in triangles.
Which characteristics will prove that Δdef is a right isosceles triangle?
Which characteristics will prove that ΔDEF is a right, isosceles triangle? The lengths of and are congruent, and their slopes are opposite reciprocals.
