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What is a triangle with at least 2 congruent sides?
Isosceles triangle: A triangle with at least two congruent sides. Equilateral triangle: A triangle with three congruent sides.
What type of triangle has two congruent angles?
isosceles triangle
And an isosceles triangle has two congruent angles. Additionally, an equilateral triangle not only has three congruent sides, but also three congruent angles all measuring 60 degrees. Likewise, an equilateral triangle is also an acute triangle.
Are all isosceles triangles congruent?
Not all isosceles right triangles are congruent. In order for two triangles to be congruent, they must have the exact same shape and the exact same…
What do you call a triangle with three congruent angles?
When a triangle has three congruent sides, we call the triangle an equilateral triangle. The angles in an equilateral triangle are always 60°. When a triangle has two congruent sides it is called an isosceles triangle. The angles opposite to the two sides of the same length are congruent.
What is a triangle with 2 equal sides called?
Isosceles. An isosceles triangle can be drawn in many different ways. It can be drawn to have two equal sides and two equal angles or with two acute angles and one obtuse angle.
What sides of a triangle are congruent?
In geometry, if two segments are congruent, then they have the same length or measure. In other words, congruent sides of a triangle have the same length. A triangle can be classified by its sides: A triangle with no congruent sides is called scalene.
How do you prove two isosceles triangles are congruent?
So here once again is the Isosceles Triangle Theorem: If two sides of a triangle are congruent, then angles opposite those sides are congruent. To make its converse, we could exactly swap the parts, getting a bit of a mish-mash: If angles opposite those sides are congruent, then two sides of a triangle are congruent.
How do you calculate a triangle?
Triangle area formula. A triangle is one of the most basic shapes in geometry. The best known and the simplest formula, which almost everybody remembers from school is: area = 0.5 * b * h, where b is the length of the base of the triangle, and h is the height/altitude of the triangle.
How do you calculate congruent triangles?
There are five ways to find if two triangles are congruent: SSS, SAS, ASA, AAS and HL. SSS stands for “side, side, side” and means that we have two triangles with all three sides equal. For example: (See Solving SSS Triangles to find out more) If three sides of one triangle are equal to three sides of another triangle, the triangles are congruent.
How to determine congruent triangles?
If three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent. If two sides and the included angle of one triangle are equal to two sides and included angle of another triangle, then the triangles are congruent.
What are the rules of congruent triangles?
Side – Angle – Side. Side Angle Side (SAS) is a rule used to prove whether a given set of triangles are congruent .