Geometry Vocabulary

Fill in the blank: The longest side of a right-angled triangle is called the _________.

• Hypotenuse.

• Adjacent.

• Opposite.

• Base.

A triangle with one angle measuring 90° is called a _________.

• Right-angled triangle.

• Equilateral triangle.

• Isosceles triangle.

• Scalene triangle.

Two lines that intersect at a 90° angle are called _________.

• Perpendicular.

• Parallel.

• Adjacent.

• Skew.

The point exactly halfway between two points on a line segment is called the _________.

• Midpoint.

• Endpoint.

• Intersection.

• Vertex.

A line that divides an angle into two equal parts is called a _________.

• Bisector.

• Divider.

• Separator.

• Splitter.

The circle that passes through all three vertices of a triangle is called the _________.

• Circumcircle

• Incircle

• Excircle

• Nine-point circle

Fill in the blank: Being at the same distance from two or more points is called being _________.

• Equidistant.

• Parallel.

• Adjacent.

• Collinear.

A line that intersects two or more lines at distinct points is called a _________.

• Transversal line.

• Parallel line.

• Perpendicular line.

• Concurrent line.

Two angles that add up to 180° are called _________.

• Supplementary angles.

• Complementary angles.

• Adjacent angles.

• Vertical angles.

Fill in the blank: Angles that are opposite each other when two lines intersect are called _________.

• Vertically opposite angles.

• Adjacent angles.

• Complementary angles.

• Supplementary angles.