WGU D127 - Mathematics for Elementary
Educators III UPDATED Exam Questions
and CORRECT Answers
line - CORRECT ANSWER- A straight one-dimensional figure that extends infinitely in both
directions.
perpendicular - CORRECT ANSWER- Describes lines intersecting each other to form a 90
degree, or right, angle.
circle - CORRECT ANSWER- The set of all points that are equidistant from a point.
radius - CORRECT ANSWER- The distance from the center of a circle or sphere to any point
on the outer edge.
isosceles trapezoid - CORRECT ANSWER- Quadrilateral with one pair of parallel opposite
sides (the bases) and another pair of equal opposite sides.
interior angle - CORRECT ANSWER- An angle inside a shape between two joined sides.
square - CORRECT ANSWER- A quadrilateral with four equal sides and four 90° angles.
regular polygon - CORRECT ANSWER- A polygon with equal sides and equal angles.
central angle - CORRECT ANSWER- Shape formed when 2 lines or rays meet with vertex
meets only the center point of the circle.
hypotenuse - CORRECT ANSWER- The largest side of a right triangle, opposite the right
angle. Only right triangles have a hypotenuse.
kite - CORRECT ANSWER- Quadrilateral with two sets of adjacent equal sides and one set
of equal opposite angles.
,reflex angle - CORRECT ANSWER- Angles greater than 180°.
vertical line - CORRECT ANSWER- A line that runs up and down on the coordinate plane,
parallel to the y-axis. It has no run, or change in x-value.
parallel - CORRECT ANSWER- Two lines, line segments, rays, or planes that are the same
distance from one another and never intersect.
trapezoid - CORRECT ANSWER- Quadrilateral with one pair of parallel opposite sides.
bisect - CORRECT ANSWER- To divide into two equal parts.
isosceles triangle - CORRECT ANSWER- A triangle with two equal sides and two equal
corresponding angles.
angle - CORRECT ANSWER- The amount of rotation (often measured in degrees) needed to
make one line segment, ray, or line identical with another line segment, ray, or line.
inscribed angles - CORRECT ANSWER- Shape formed when 2 lines or rays meet with a
vertex that meets the circumference of a circle.
vertex - CORRECT ANSWER- A point where two line segments meet to form an angle.
irregular polygon - CORRECT ANSWER- A polygon whose sides are not all equal and
whose angles have different measures.
straight angle - CORRECT ANSWER- An angle that measures 180 degrees.
line segment - CORRECT ANSWER- Shortest distance between two points; completely
straight with two endpoints.
, rectangle - CORRECT ANSWER- Quadrilateral with four right angles, equal opposite sides,
and two sets of parallel opposite sides.
sector - CORRECT ANSWER- A portion of a circle defined by two radii and an intercepted
arc.
triangle inequality theorem - CORRECT ANSWER- For every triangle, the sum of any two
sides is always greater than the third side.
parallelogram - CORRECT ANSWER- Quadrilateral with opposite, parallel, equal sides and
equal opposite angles.
ray - CORRECT ANSWER- A line with a single endpoint (or point of origin) that extends
infinitely in the other direction.
acute angle - CORRECT ANSWER- Angles less than 90°.
equilateral triangle - CORRECT ANSWER- A triangle with three equal sides and three angles
of 60 degrees each.
x-axis - CORRECT ANSWER- The horizontal line that passes through the origin on a
coordinate plane.
origin - CORRECT ANSWER- The point on a coordinate plane where the x-axis and y-axis
intersect. Typically, the point represents 0 on both axes.
center - CORRECT ANSWER- The point from which all the points on a circle are
equidistant.
right angle - CORRECT ANSWER- An angle of 90°
diameter - CORRECT ANSWER- The distance from one side of a circle to the other side that
passes through the center point.
Educators III UPDATED Exam Questions
and CORRECT Answers
line - CORRECT ANSWER- A straight one-dimensional figure that extends infinitely in both
directions.
perpendicular - CORRECT ANSWER- Describes lines intersecting each other to form a 90
degree, or right, angle.
circle - CORRECT ANSWER- The set of all points that are equidistant from a point.
radius - CORRECT ANSWER- The distance from the center of a circle or sphere to any point
on the outer edge.
isosceles trapezoid - CORRECT ANSWER- Quadrilateral with one pair of parallel opposite
sides (the bases) and another pair of equal opposite sides.
interior angle - CORRECT ANSWER- An angle inside a shape between two joined sides.
square - CORRECT ANSWER- A quadrilateral with four equal sides and four 90° angles.
regular polygon - CORRECT ANSWER- A polygon with equal sides and equal angles.
central angle - CORRECT ANSWER- Shape formed when 2 lines or rays meet with vertex
meets only the center point of the circle.
hypotenuse - CORRECT ANSWER- The largest side of a right triangle, opposite the right
angle. Only right triangles have a hypotenuse.
kite - CORRECT ANSWER- Quadrilateral with two sets of adjacent equal sides and one set
of equal opposite angles.
,reflex angle - CORRECT ANSWER- Angles greater than 180°.
vertical line - CORRECT ANSWER- A line that runs up and down on the coordinate plane,
parallel to the y-axis. It has no run, or change in x-value.
parallel - CORRECT ANSWER- Two lines, line segments, rays, or planes that are the same
distance from one another and never intersect.
trapezoid - CORRECT ANSWER- Quadrilateral with one pair of parallel opposite sides.
bisect - CORRECT ANSWER- To divide into two equal parts.
isosceles triangle - CORRECT ANSWER- A triangle with two equal sides and two equal
corresponding angles.
angle - CORRECT ANSWER- The amount of rotation (often measured in degrees) needed to
make one line segment, ray, or line identical with another line segment, ray, or line.
inscribed angles - CORRECT ANSWER- Shape formed when 2 lines or rays meet with a
vertex that meets the circumference of a circle.
vertex - CORRECT ANSWER- A point where two line segments meet to form an angle.
irregular polygon - CORRECT ANSWER- A polygon whose sides are not all equal and
whose angles have different measures.
straight angle - CORRECT ANSWER- An angle that measures 180 degrees.
line segment - CORRECT ANSWER- Shortest distance between two points; completely
straight with two endpoints.
, rectangle - CORRECT ANSWER- Quadrilateral with four right angles, equal opposite sides,
and two sets of parallel opposite sides.
sector - CORRECT ANSWER- A portion of a circle defined by two radii and an intercepted
arc.
triangle inequality theorem - CORRECT ANSWER- For every triangle, the sum of any two
sides is always greater than the third side.
parallelogram - CORRECT ANSWER- Quadrilateral with opposite, parallel, equal sides and
equal opposite angles.
ray - CORRECT ANSWER- A line with a single endpoint (or point of origin) that extends
infinitely in the other direction.
acute angle - CORRECT ANSWER- Angles less than 90°.
equilateral triangle - CORRECT ANSWER- A triangle with three equal sides and three angles
of 60 degrees each.
x-axis - CORRECT ANSWER- The horizontal line that passes through the origin on a
coordinate plane.
origin - CORRECT ANSWER- The point on a coordinate plane where the x-axis and y-axis
intersect. Typically, the point represents 0 on both axes.
center - CORRECT ANSWER- The point from which all the points on a circle are
equidistant.
right angle - CORRECT ANSWER- An angle of 90°
diameter - CORRECT ANSWER- The distance from one side of a circle to the other side that
passes through the center point.
