Unit Review: Triangle & polygon angles

J.1Find each missing angle.

1. 1
   ? = 
2. 2
   ? = 
3. 3
   ? = 
4. 4
   ? = 

J.2Answer each question.

1. 5
   A triangle's angles measure $(3x+15{)}^{\circ }$, $x^{\circ }$, and $(2x+15{)}^{\circ }$. Find $x$.
2. 6
   A triangle's angles measure $(2x+10{)}^{\circ }$, $(x+14{)}^{\circ }$, and $x^{\circ }$. Find $x$.

J.2Answer each question. (continued)

1. 7
   A triangle's angles measure $(4x+26{)}^{\circ }$, $x^{\circ }$, and $(x+40{)}^{\circ }$. Find $x$.
2. 8
   A triangle's angles measure $(2x+57{)}^{\circ }$, $(3x+15{)}^{\circ }$, and $x^{\circ }$. Find $x$.

J.3All polygons are regular.

1. 9
   Dodecagon: exterior angle = 
2. 10
   Decagon: exterior angle = 
3. 11
   Exterior $72^{\circ }$: sides = 
4. 12
   Exterior $18^{\circ }$: sides = 

J.1Exterior Angle Theorem

1. 1$35^{\circ }$
2. 2$55^{\circ }$
3. 3$125^{\circ }$
4. 4$70^{\circ }$

J.2Triangle Angles with Ratios & Equations

1. 5$x=25$
2. 6$x=39$
3. 7$x=19$
4. 8$x=18$

J.3Exterior Angles of Polygons

1. 9$30^{\circ }$
2. 10$36^{\circ }$
3. 115
4. 1220