Geometry Terms An angle whose measure is

between 0 degrees and

90 degrees. Acute Angle Collinear When two lines are

lying in the same straight line. Prism A solid geometric figure whose two end

faces are similar, equal, and parallel

rectilinear figures, and whose sides

are parallelograms. Complementary Angles Either of two angles whose sum is

90 degrees. Ray A portion of a line which starts at

a point and goes off in a particular

direction to infinity. Right Angle

An angle of 90 degrees, like a

corner of a square. Translation Moving a shape and still having it stay the same way Median In or pertaining to the middle. Triangle a closed plane figure having three

sides and three angles Conjecture An educated guess or opinion Contra Positive Opposite or against Converse A reversed conditional. Cosine

That it is equal to the ratio of the side

adjacent to an acute angle to the

hypotenuse. Center The point on a line that is

midway between the ends. Sphere A 3-dimensional object shaped

like a ball. Two angles that have a common side and a common vertex. Adjacent Angles Midpoint Midpoint of a line segment is the

point that is halfway between the

endpoints of the line segment. Perimeter the distance around a figure Cylinder A three-dimensional figure

that has two congruent

and parallel bases. Point A certain location or place

on a plane. Polygon is a plane shape with straight sides. Corresponding Parts If the relative position of two sides is

same in two figures Reflection Is a transformation in which the

figure is the mirror image of the other. Coplanar A set of points, lines, line segments,

rays or any other geometrical shapes

that lie on the same plane. Degree A measure of an angle. Distance A measurement of how far

through space. Rectangle A 4-sided flat shape with straight

sides. Trapezoid Any rectilinear quadrilateral plane figure

not a parallelogram. Angle of Depression Is the angle between the horizontal and

the line of sight to an object beneath

the horizontal. Sine The ratio of the side opposite a

given acute angle to the hypotenuse. Pythagorean

Theorem The square of the hypotenuse of

a right triangle is equal to the sum

of the squares of the other two sides. Line Segment A line linking two points. Geometry The branch of mathematics that deals with the

deduction of the properties, measurement, and

relationships of points, lines, angles, and figures Pyramid Is a polyhedron with a polygonal

base and triangles for sides. Angle Obtuse, acute, and right. Theorem Is a true statement that can

be proven. Plane Is a flat two-dimensional surface. Equidistant A point the same distance from two or

more other points. Slope Rise over run. Isosceles Having two sides equal. Scalene

Triangle A triangle with all sides of different lengths.

No sides are equal and no angles are equal. Vertex A point where two or more

straight lines meet. Vertical Angles Are the angles opposite each other

when two lines cross. Rhombus A 4-sided flat shape with straight sides where

all sides have equal length. Proportion An equation written in the form stating that

two ratios are equivalent. Angle of

Elevation The angle between the horizontal and the line of sight to an object above the horizontal. Tangent A line which touches a

circle or ellipse

at just one point. Linear Pair A pair of adjacent angles that

form a straight line. Postulate A true statement, which does

not require to be proved. Area The size of a surface. The amount of space

inside the boundary of a flat object. Cube A three-dimensional figure with

six square faces. Angle Bisector A ray that divides an angle into

two equal parts. Diameter A line segment that passes through the center

of a circle with both its endpoints lying on the circle. Inscribed To draw within another figure so that

every vertex of the enclosed figure touches

the outer figure. Parallel Lines are distinct lines lying

in the same plane and they

never touch. Corresponding

Angles Are two congruent angles, both lying

on the same side of the transversal. Transversal A line that cuts across two or more

(usually parallel) lines. Cone A three-dimensional figure that has one circular base and one vertex. Convex Curved outwards. Altitude A line segment connecting a

vertex to the line containing

the opposite side Diagonal A straight line inside a shape

that goes from one corner to

another. Parallelogram A 4-sided flat shape with straight sides

where opposite sides are parallel. Square A regular quadrilateral. Pi 3.14 Interior When two lines are cut by a third line,

then the angles formed inside the lines. Line A geometrical object that is straight,

infinitely long and infinitely thin. Inductive Reasoning To arrive at a conclusion based on several observations. Chord A line segment that joins two points

on the circumference of a circle. Volume The measure of the amount of space

inside of a solid figure. Obtuse Angle More than 90 degrees but less than 180 degrees. Circumference The complete distance around a

circle or a closed curve. Perpendicular At right angles. Radius The distance from the center to the

edge of a circle. Secant A straight line that intersects a curve

at two or more points. Concave Curved inwards. Congruent Angles that have exactly

the same measure. Concurrent Concurrent lines or line segments occur when

3 or more lines meet at the same point. Kite A 4-sided flat shape with straight sides that has

two pairs of sides each pair is adjacent sides

that are equal in length. Arc A curved line that is a

part of a circle. Circle Closed plane curve consisting of

all points at a given distance. RAY RIGHT ANGLE SPHERE PERIMETER POLYGON Pyramid

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# Geometry Terms

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by Gillian James
on 21 September 2012
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