Geometry Vocabulary

What is the name of a 2D shape with 3 sides?

• circle

• square

• pentagon

• triangle

What is the diameter of a circle?

• The diameter of a circle is the same as its circumference.

• The diameter of a circle is twice the length of its radius.

• The diameter of a circle is half the length of its radius.

• The diameter of a circle is the same as its area.

What is the radius of a circle?

• The perimeter of the circle

• The distance from the center to any point on the circle

• The diameter of the circle

• The area of the circle

Name a type of quadrilateral with opposite sides parallel and equal in length.

• Rhombus

• Pentagon

• Parallelogram

• Trapezoid

Two lines that never intersect are __________ lines.

• Perpendicular

• Right

• Parallel

Classify the triangle with angles measuring 90°, 45°, and 45°.

• Obtuse triangle

• Acute triangle

• Right isosceles triangle

• Equilateral triangle

Define a polygon.

• A shape with no sides or angles

• A figure with only curved lines

• A closed figure formed by straight lines

• A circle with a hole in the middle

a closed figure made up of line segments that do not cross each other

• polygon

• parallelogram

a polygon with congruent sides and congruent angles

• regular polygon

• irregular polygon

a triangle with 3 congruent sides

• equilateral triangle

• isosceles triangle

• scalene triangle