Types of Triangles
A triangle with an angle that measures more than 90
Obtuse
The angles in a triangle add to this
180
Three sides from one triangle are congruent to the three sides of the other
SSS
The angles in an equilateral triangle
60 degrees
The first reason of every proof
GIVEN
The type of triangle with angle measures 70, 80, 30
Acute
This angle is equal to the sum of the two remote interior angles
Exterior angle
I have two triangles with corresponding congruent angles and the side NOT between them
AAS
Congruent sides opposite
Congruent angles
Allows us to go from congruent to equal and equal to congruent
Def of Congruence
A regular triangle is both of these
Equilateral and Equiangular
A triangle can only have one of these two types of angles
Obtuse or right
When there are two pairs of congruent sides and the included angle
SAS
Congruent angles opposite
congruent sides
A triangle has 3 of each of these
sides and angles
This type of triangle has two angles with the same measure. Name by sides.
Isosceles
How can we prove that a triangle is scalene
Distance formula coordinate proof
I have two right triangles with congruent legs
LL
The vertex of an isosceles triangle is located where in relation to the other points
the middle
Midpoint
These form right angles
Perpendicular Lines
The triangle based on sides with angle measures 65, 35, 80
Scalene
We use this formula to show that a triangle is a right triangle
slope formula
This shortcut is used when we have two pairs of congruent sides and then an angle as we go around the triangle. Oh yeah, its right!
HL
The acute angles in this isosceles right triangle will always be this
45 degrees
What does CPCTC stand for
corresponding parts of congruent triangle are congruent