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Geometry Terms

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by Gillian James on 21 September 2012

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Transcript of Geometry Terms

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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