Unit Review: Triangles & polygons

S.1Answer each question.

1. 1
   Can sides of $18$, $11$, and $26$ meters form a triangle? 
2. 2
   Can sides of $17$, $13$, and $34$ centimeters form a triangle? 
3. 3
   Can sides of $13$, $16$, and $28$ meters form a triangle? 
4. 4
   Can sides of $19$, $20$, and $24$ centimeters form a triangle? 

S.2Find each missing angle.

1. 5
   Find the missing angle. 
2. 6
   Find the missing angle. 

S.2Find each missing angle. (continued)

1. 7
   Find the missing angle. 
2. 8
   Find the missing angle. 

S.3Ticks: equal sides. Arrows: parallel sides. Squares: right angles. Names: square, rectangle, rhombus, parallelogram, trapezoid, quadrilateral.

1. 9
   All its names: 
2. 10
   All its names: 
3. 11
   All its names: 
4. 12
   All its names: 

S.4Count the sides. Use (n − 2) × 180° for the sum of the interior angles.

1. 13
   Sum of the interior angles: 
2. 14
   Regular polygon. Each interior angle: 

S.4Count the sides. Use (n − 2) × 180° for the sum of the interior angles. (continued)

1. 15
   Sum of the interior angles: 
2. 16
   Sum of the interior angles: 

S.1Triangle Inequality

1. 1yes
2. 2no
3. 3yes
4. 4yes

S.2Angles in Triangles

1. 5$63^{\circ }$
2. 6$19^{\circ }$
3. 7$149^{\circ }$
4. 8$70^{\circ }$

S.3Classify Quadrilaterals

1. 9parallelogram
2. 10trapezoid
3. 11parallelogram, rectangle, rhombus, square
4. 12parallelogram

S.4Interior Angles of Polygons

1. 13$360^{\circ }$
2. 14$135^{\circ }$
3. 15$360^{\circ }$
4. 16$540^{\circ }$