Polygons
Triangles
Quadrilaterals
Multi-Sided Figures
Vocabulary
100
What is a polygon?
A polygon is a closed, flat (2D) shape with at least 3 straight lines and 3 angles.
100
How could you classify this triangle?
Acute, Obtuse, Right, Equilateral, Isosceles, or Scalene
Equilateral, Isosceles, and Acute
100
What is a quadrilateral?
A four-sided shape.
100
How many sides does a triangle have?
Three
100
Explain the difference between an acute angle, obtuse angle, and right angle.
An acute angle is less than 90 degrees. An obtuse angle is greater than 90 degrees and a right angle is exactly 90 degrees.
200
Explain the difference between a regular polygon and an irregular polygon.
Regular polygon - all sides and angles are congruent
Irregular polygon - sides and angles are different
200
How could you classify this triangle?
Acute, Obtuse, Right, Equilateral, Isosceles, or Scalene
Right and Isosceles
200
Name all the classifications for this figure.
trapezoid and quadrilateral
200
Identify the name of the following shape.
Octagon
200
What does parallel mean?
Two lines that will never touch or intersect.
300
Is this figure a polygon? Why or why not?
No, because it is an open shape and polygons are closed shapes.
300
An equilateral triangle is always an isosceles triangle. True or False, and why?
True. In an isosceles triangle, 2 sides are the same, and this same characteristic applies to an equilateral triangle.
300
How many pairs of congruent sides does it have?
How many pairs of congruent angles does it have?
Congruent sides - 2 pairs
Congruent angles - 1 pair
300
What is the difference between a hexagon and a heptagon?
A hexagon has 6 sides and angles.
A heptagon has 7 sides and angles.
300
What does congruent mean?
Equal or the same
400
Is this a regular polygon? Why or why not?
No, because the side lengths and angle measures are different.
400
Fill in the blanks.
Triangle FGH is an isosceles triangle while the others are equilateral triangles.
400
A kite is a rhombus. True or false, and why?
False. A rhombus has 4 sides that are the same, but that is not always true with a kite. The reverse is true - a rhombus can be a kite.
400
Name this multi-sided figure.
Decagon
400
Explain the difference between a scalene triangle, equilateral triangle, and an isosceles triangle.
Scalene - no sides or angles are the same
Equilateral - all sides and angles are the same
Isosceles - two sides and two angles are the same
500
Mariah says that both polygons are regular octagons. Is she correct? Explain why or why not.
She is incorrect. While they are both octagons, both figures are actually irregular.
Left - has different size angles, but similar side lengths
Right - has similar size angles, but different side lengths
500
Choose two correct answers based on the following triangle.
A) It has one right angle.
B) It has three equal sides.
C) It has an obtuse angle.
D) No sides are the same.
B and D
500
Name all the classifications of a square.
Square, rectangle, rhombus, parallelogram, quadrilateral
500
Classify this shape.
Determine if it is a regular or irregular polygon and why.
Pentagon
It is irregular because not all the sides and angles are the same length.
500
What does adjacent mean?
Example - A kite has two equal adjacent sides.
Next to
Example - A kite has two equal adjacent sides (sides that are next to each other.)