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Geometry To Know

Study the major geometry terms you need to know.

QuestionAnswer
a one dimensional figure that extends forever in both directions line
part of a line, with two endpoints segment
a point at the end of a line segment or ray endpoint
a part of a line that has one endpoint and extends forever in the other direction ray
to cross through the same point intersect
two lines that cross (intersect) at right angles perpendicular
two lines, segments, or rays that do not cross, no matter how far they extend parallel
two rays with the same endpoint angle
each of the rays forming an angle side
the common endpoint of two rays forming an angle vertex
a unit of angle measure ( 1/360 of a complete circle), represented with (°) degree
a tool that measures angles protractor
an angle that measures 90°, it forms a perfect corner right angle
an angle smaller than a right angle acute angle
an angle greater than a right angle but smaller than a straight angle (between 90° and 180°) obtuse angle
an angle formed by two rays pointing in opposite directions (180° angle) straight angle
two angles whose measures add up to 90°; they make a Corner complimentary angles
two angles whose measures add up to 180°; they make a Straight line supplementary angles
angles with the exact same measure congruent angles
a closed figure made of line segments polygon
a closed figure made from three line segments triangle
The sum of the angles in a triangle must equal 180 degrees
a triangle with three acute angles (all angles < 90°) acute triangle
a triangle with an obtuse angle (one angle > 90°) obtuse angle
a triangle with a right angle (one angle=90°) right angle
the longest side of a right triangle (the side opposite the right angle) hypotenuse
either of the two sides in a right triangle that form the right angle leg (of a right triangle)
a triangle with three sides of the same length equilateral triangle
a triangle with at least two sides of the same length isosceles triangle
a triangle with no sides of equal length scalene triangle
a polygon whose sides and angles have equal measures regular polygon
a polygon that does NOT have all sides and angles equal irregular polygon
two polygons with the exact same shape but of different size congruent polygons
a closed figure made from 4 line segments quadrilateral
a closed figure made from 5 line segments pentagon
a closed figure made from 6 line segments hexagon
a closed figure made from 7 line segments heptagon
a closed figure made from 8 line segments octagon
a closed figure made from 9 line segments nonagon
a closed figure made from 10 line segments decagon
The sum of the angles in a quadrilateral must equal 360 degrees
a quadrilateral with exactly two sides parallel trapezoid
a quadrilateral whose opposite sides are parallel and equal parallelogram
a parallelogram with all sides the same length (irregular quadrilateral, parallelogram) rhombus
a parallelogram with opposite sides the same length and all angles measuring 90° (irregular quadrilateral, parallelogram) rectangle
a parallelogram with all sides the same length and all angles measuring 90°(regular quadrilateral, parallelogram, rhombus) square
a set of points that are a given distance from a center point circle
the distance around the outside of a circle circumference
a line segment from the center of the circle to any point on the circle radius
a line segment whose endpoints are on a circle chord
a line segment connecting two points on a circle and passing through the center (a special kind of chord) diameter
a flat surface that extends forever in all directions plane
a location on a plane with no length, no width, and no depth point
a set of lines used to locate points on a plane coordinate plane
vertical axis (up & down) y-axis
horizontal axis (across) x-axis
always read the ____-axis first X
a pair of numbers used to locate a point on a coordinate plane (x,y) ordered pair(coordinates)
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