Classifying 2-D Shapes

A three sided polygon

• Triangle

• Quadrilateral

• Pentagon

• Hexagon

A triangle with two equal sides and two equal angles.

• equilateral triangle

• isosceles triangle

• scalene triangle

A triangle with all equal sides and angles.

• equilateral triangle

• isoceles triangle

• scalene triangle

A triangle with no equal sides and no equal angles.

• equilateral triangle

• isoceles triangle

• scalene triangle

Which of the following describes a regular triangle?

• A polygon with three congruent sides, and three congruent angles.

• A polygon with four congruent sides, and four congruent angles.

• A polygon with five congruent sides, and five congruent angles.

• A polygon with six congruent sides, and six congruent angles.

Which of the following describes a regular octagon?

• A polygon with seven congruent sides, and seven congruent angles.

• A polygon with eight congruent sides, and eight congruent angles.

• A polygon with nine congruent sides, and nine congruent angles.

• A polygon with ten congruent sides, and ten congruent angles. 

Which of the following describes a regular hexagon?

• A polygon with three congruent sides, and three congruent angles.

• A polygon with four congruent sides, and four congruent angles.

• A polygon with five congruent sides, and five congruent angles.

• A polygon with six congruent sides, and six congruent angles.

Which of the following describes a regular heptagon?

• A polygon with seven congruent sides, and seven congruent 

  angles.

• A polygon with eight congruent sides, and eight congruent 

  angles.

• A polygon with nine congruent sides, and nine congruent 

  angles.

•  A polygon with ten congruent sides, and ten congruent angles. 

A nine-sided polygon

• Heptagon

• Hexagon

• Nonagon

• Decagon

A ten-sided polygon

• Triangle

• Decagon

• Heptagon

• Octagon