WGU Math for Educators D128 Exam
Questions And Answers
Sum of a polygon - Answer(n-2)180
/.Right angle - Answer90 degrees
/.acute angle - Answerless than 90 degrees
/.obtuse angle - Answergreater than 90 degrees and less than 180 degrees
/.reflex angle - Answergreater than 180 degrees
/.complementary angles - AnswerTwo angles whose sum is 90 degrees
/.supplementary angles - AnswerTwo angles whose sum is 180 degrees
/.interior angles of a polygon - Answerangles inside of a polygon
/.triangle - AnswerA polygon with three sides whose interior angles equal 180.
/.isosceles triangle - AnswerA triangle that has 2 equal sides.
/.equilateral triangle - Answera triangle with 3 equal sides (60 degrees)
/.Triangle Inequality Theorem - AnswerThe sum of the lengths of any two sides of a
triangle must be greater than the length of the third side
/.scalene triangle - Answerno equal sides
/.quadrilateral - Answera four-sided polygon with interior angles adding to 360 degrees
/.Parallelogram - AnswerA quadrilateral with two pairs of parallel sides
/.square - AnswerA quadrilateral with 4 sides that are equal and has all 90 degree
angles
/.rectangle - Answera parallelogram with 4 right angles
/.Rhombus - AnswerA parallelogram with four congruent sides.
/.Trapezoid - AnswerA quadrilateral with exactly one pair of parallel sides
, /.isosceles trapezoid - Answera trapezoid whose nonparallel opposite sides are
congruent
/.kite - Answera quadrilateral with two pairs of adjacent sides congruent and no opposite
sides congruent
/.Hypotenuse - Answerthe side of a right triangle opposite the right angle
/.legs of a right triangle - Answerthe sides adjacent to the right angle
/.Pythagorean Theorem - Answera²+b²=c²
/.acute angle on a right triangle - Answer90 degrees
/.circle - AnswerThe set of all points in a plane that are the same distance from a given
point called the center
/.diameter - Answerthe distance across a circle through its center
/.Radius - AnswerThe distance from the center of a circle to any point on the circle
/.Tangent - AnswerA line in the plane of a circle that intersects the circle in exactly one
point.
/.circumference - AnswerThe distance around a circle
/.Circumference of a circle - AnswerC=2πr or C=πd
/.area - AnswerThe space inside the shape
/.Area of a circle - AnswerA=πr²
/.Arcs - Answera part of the circumference of a circle.
/.sector - AnswerThe part of a circle that looks like a piece of pie. A sector is bounded
by 2 radii and an arc of the circle.
/.Solving for angles and arcs - AnswerCentral angle/360•=arc length/2πr= area
of sector/πr²
/.central angle - AnswerVertices are on the center of the circle
/.inscribed angle - Answeran angle whose vertex is on the circle
/.Transformation - AnswerHow figures can transform on the plane to make other figures.
Questions And Answers
Sum of a polygon - Answer(n-2)180
/.Right angle - Answer90 degrees
/.acute angle - Answerless than 90 degrees
/.obtuse angle - Answergreater than 90 degrees and less than 180 degrees
/.reflex angle - Answergreater than 180 degrees
/.complementary angles - AnswerTwo angles whose sum is 90 degrees
/.supplementary angles - AnswerTwo angles whose sum is 180 degrees
/.interior angles of a polygon - Answerangles inside of a polygon
/.triangle - AnswerA polygon with three sides whose interior angles equal 180.
/.isosceles triangle - AnswerA triangle that has 2 equal sides.
/.equilateral triangle - Answera triangle with 3 equal sides (60 degrees)
/.Triangle Inequality Theorem - AnswerThe sum of the lengths of any two sides of a
triangle must be greater than the length of the third side
/.scalene triangle - Answerno equal sides
/.quadrilateral - Answera four-sided polygon with interior angles adding to 360 degrees
/.Parallelogram - AnswerA quadrilateral with two pairs of parallel sides
/.square - AnswerA quadrilateral with 4 sides that are equal and has all 90 degree
angles
/.rectangle - Answera parallelogram with 4 right angles
/.Rhombus - AnswerA parallelogram with four congruent sides.
/.Trapezoid - AnswerA quadrilateral with exactly one pair of parallel sides
, /.isosceles trapezoid - Answera trapezoid whose nonparallel opposite sides are
congruent
/.kite - Answera quadrilateral with two pairs of adjacent sides congruent and no opposite
sides congruent
/.Hypotenuse - Answerthe side of a right triangle opposite the right angle
/.legs of a right triangle - Answerthe sides adjacent to the right angle
/.Pythagorean Theorem - Answera²+b²=c²
/.acute angle on a right triangle - Answer90 degrees
/.circle - AnswerThe set of all points in a plane that are the same distance from a given
point called the center
/.diameter - Answerthe distance across a circle through its center
/.Radius - AnswerThe distance from the center of a circle to any point on the circle
/.Tangent - AnswerA line in the plane of a circle that intersects the circle in exactly one
point.
/.circumference - AnswerThe distance around a circle
/.Circumference of a circle - AnswerC=2πr or C=πd
/.area - AnswerThe space inside the shape
/.Area of a circle - AnswerA=πr²
/.Arcs - Answera part of the circumference of a circle.
/.sector - AnswerThe part of a circle that looks like a piece of pie. A sector is bounded
by 2 radii and an arc of the circle.
/.Solving for angles and arcs - AnswerCentral angle/360•=arc length/2πr= area
of sector/πr²
/.central angle - AnswerVertices are on the center of the circle
/.inscribed angle - Answeran angle whose vertex is on the circle
/.Transformation - AnswerHow figures can transform on the plane to make other figures.
