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### Ext. Sides Adj. Acute ∠s ⊥, complementary

if the exterior side of two adjacent acute ∠s are ⊥, then the ∠ are complementary ∠

### The sum of the measures of the exterior angles of any convex polygon, one angle at each vertex, is 360.

in triangle abc, the measures of the ext. ∠s = 360.

in parallelogram abcd, the measures of the ext. ∠s = 360

### ASA

if two ∠s and the included side of one triangle are ≅ to to ∠s and the included side of another triangle, then the triangles are ≅

### SAS

if two sides and the included ∠ of one triangle are congruent to two sides and the included ∠ of another triangle, then the triangles are ≅

### SSS

if three sides of one triangle are ≅ to three sides of another triangle, then the triangles are ≅

### Properties of Equilateral/Equiangular Triangles

-an equiangular triangle is also equilateral

-an equiangular triangle is also equilateral

-an equilateral triangle has 3 60 degree angles

### AAS

If two angles and a non-included side of one triangle are ≅ to the corresponding parts of another triangle, then triangles are ≅