Chapter 5 Quiz Review

Isosceles triangle

At least two congruent sides

Scalene triangle

No congruent sides of a triangle

Equilateral

3 congruent sides

Acute

All angles <90 degrees

Obtuse

One angle >90 degrees

Right

One right <

Equiangular

3 congruent <‘s

Corollary

A statement easily proved with a theorem

Remote interior <‘s in/outside a triangle

Exterior < is = the sum of two remote interior <‘s

Corresponding parts

<‘s or sides of a figure that share the same position in two SEPARATE figures (letters match to spots)

Third <‘s theorem

If two <‘s of one triangle are congruent to 2 <‘s of another, then the 3rd <‘s are congruent to each other

Corresponding parts of congruent triangles are congruent

CPCTC

Side-Angle-Side Theorem

SAS

Included <

Has to fall between the known sides

Vertex

The < that falls between the legs of an isosceles triangle

Base angles theorem

If 2 sides of a triangle of congruent, then the angles opposite of them are congruent

Converse of base angles theorem

If 2 angles of a triangle are congruent, then the sides opposite of them are congruent

Corollary to base <‘s theorem

If triangle is equilateral, then it is equiangular

Corollary to converse of base <‘s theorem

If triangle is equiangular, then it is equilateral

Legs

When an isosceles triangle has two congruent sides, the two congruent sides are called