8th Grade Geometry Vocabulary

In geometry, what is a "vertex"?

• The center of a circle

• A point where two or more lines meet

• The longest side of a triangle

• The space inside a shape

What is the difference between a radius and a diameter of a circle?

• The radius is twice the diameter

• The diameter is twice the radius

• They are the same length

• The radius goes around the circle, the diameter goes through it

What does "congruent" mean when referring to geometric shapes?

• Having the same shape but different sizes

• Having the same size and shape

• Having the same area but different shapes

• Having the same perimeter but different shapes

What is the name of a polygon with exactly eight sides?

• Hexagon

• Heptagon

• Octagon

• Nonagon

In geometry, what does "parallel" mean?

• Lines that intersect at a right angle

• Lines that never intersect and are always the same distance apart

• Lines that intersect at any angle

• Lines that form a triangle

What is the difference between an acute angle and an obtuse angle?

• An acute angle is larger than 90°, an obtuse angle is smaller than 90°

• An acute angle is smaller than 90°, an obtuse angle is larger than 90°

• An acute angle is exactly 90°, an obtuse angle is any other angle

• There is no difference; they are the same thing

What is a "transversal" in relation to parallel lines?

• A line that is parallel to both lines

• A line that is perpendicular to both lines

• A line that intersects two parallel lines

• A line that bisects both parallel lines

What does "perpendicular" mean when describing the relationship between two lines?

• The lines are parallel

• The lines intersect at a 90° angle

• The lines never intersect

• The lines form a 45° angle

What does "supplementary" mean when referring to angles?

• The angles add up to 90°

• The angles add up to 180°

• The angles are the same size

• The angles form a right angle

What is the name of a three-dimensional shape with six square faces?

• Cube

• Pyramid

• Sphere

• Cylinder