Classifying Triangles
No Equal Sides or Angles
What is Scalene
Number of angles in a triangle.
What is 3 angles
Stands for SSS
What is Side-Side-Side
This congruence shortcut stands for “Hypotenuse–Leg.”
What is the HL
Has two congruent sides called legs.
What is Isosceles Triangle
Two equal sides and angles
What is Isosceles
The value of all three angles in a triangle added together.
What is 180 degrees
If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then these two triangles are congruent.
What is SAS
This type of triangle is the only kind where HL congruence can be used.
What is a right triangle?
All three sides are congruent.
What is Equilateral Triangle
All sides and angles are equal.
What is Equilateral
When two lines intersect the opposite angles are equal to each other.
What is vertical angles
To use HL, you must know the hypotenuse and this additional part of the triangle are congruent.
What is one leg
All three angles equal 60 degrees.
What is Equiangular.
Has an angle whose measurement is greater than 90 degrees.
What is Obtuse
The little box in the corner of a triangle.
What is 90 degrees.
This side of a right triangle must be congruent in both triangles for HL to work, and it is always the longest side.This side of a right triangle must be congruent in both triangles for HL to work, and it is always the longest side.
What is the hypotenuse?
When the two sides are congruent, its respective angles are congruent
What is Isosceles Triangle
All angles measure less than 90 degrees.
What is acute.
An exterior angle of a triangle is equal to the sum of the opposite interior angles.
What is Exterior Angle Theorem
Two triangles both have a 10 cm hypotenuse and a 6 cm leg. Each triangle contains a right angle. Can you use HL to prove congruency? Why or why not? Draw a picture.
Yes
The point where two congruent sides come together.
What is Vertex