Transcript Geometry Period 3

Geometry Vocab
Stephanie Jimenez
Angle
• The union of two rays having a common
endpoint, the rays are the sides of the angle
and the common endpoint is the vertex
Dodecagon
24.08.2009
• A polygon having twelve sides
• A dodecagon has twelve sides.
Scalene Triangle 25.08.2009
• Triangle having no sides of the same length
• They are three kinds of triangles: isosceles,
scalene and…….. equal triangle.
Concentric Circles 26.08.2009
• Circles having the same center but with
different radii
• Many concentric circles have a different radii.
Postulate
27.08.2009
• A statement accepted as true without having
to be proven to be true
• He postulated that the circle was round.
Hypotenuse 31.08.09
• The side opposite the right angle in a right
triangle: the longest side of a right triangle
Compass
1.09.09
• A construction tool used to draw arcs and
circles
Circle
3.09.09
• The set of all points in a plane that are
equidistant from a given point known as the
center of the circle
• (x-h)2 + (y-k)2 =r2
Acute Angle
• An angle having a measure greater that 0
degrees but less then 90 degrees
Complementary Angles 9.9.09
• Two angles whose sum equals 90 degrees
Diameter 9.10.09
• A chord that passes through the center of a
circle
Parallel Lines
11.09.09
• Coplanar lines that do not intersect
Polygon
14.09.09
• A plane figure bounded by a number of line
segments; the minimum number of sides is 3
Theorem 15.09.09
• A statement in math which must be proven to
true
Adjacent Angles 17.09.09
• Two angles having a common side and vertex
but do not overlap; no common interior points
Orthogonal
• Intersecting of right angles
18.09.09
Hemisphere
21.09.09
• the surface bounded by half of a sphere and a
plane through the center of the sphere
Incenter 23.09.09
• the point of concurrency of the triangle’s
angle bisectors
KITE 24.09.09
• a quadrilateral in which two disjoint pairs of
consecutive sides are congruent
Collinear 25.09.09
• points that lie on the same line
• A collinear line has points in it.
Skew Lines
29.09.09
• lines that do nor intersect and are not
coplanar
Perpendicular Lines 30.09.09
• lines that intersect at right angles
Transversal
01.10.09
• a line which intersects two or more coplanar
lines in distinct points
Obtuse Angle
02.10.09
• an angle having a measure greater than 90
degrees but les than 180 degrees
Prism 05.10.09
• a polyhedron with two congruent faces, called
bases, that lie in parallel planes; the other
faces are called lateral faces
Proof 06.10.09
• a convincing argument that shows why a
statement is true
Slant Height 08.10.09
• the height of a lateral face of a pyramid
• the mouse ran up the slant height of the grain
pile
Circumference
• the distance around a circle
09.10.09
Straightedge 12.10.09
• a construction tool used to draw segments: a
ruler without marks
Inscribed Angle
13.10.09
• an angle of a circle having its vertex on the
circle and the sides of the angle are chords of
the circle
Isosceles Triangle 14.10.09
• a triangle with at least two congruent sides;
equilateral triangles are isosceles
Hypothesis 15.10.09
• the phrase following the word “if” in a
conditional statement
Octagon
16.10.09
• a polygon having eight sides
• A stop sign is an octagon.
Logic
19.10.09
• the analysis of the patterns of reasoning by
which conclusions are validly derived from
sets of premises
Similar Figures 20.10.09
• figures that have the same shape
• Similar figures have the same shape.
Angle of depression 21.10.09
• an angle formed by a horizontal line and the
line of sight to an object below the level of the
horizontal
Rhombus
10.22.09
• a quadrilateral with four equal sides
• A kite is a rhombus.
Rectangle
10.23.09
• parallelogram with 4 right angles
• We found the area of the rectangle in class.
Deductive Reasoning 26.10.09
• a process of reasoning logically from given
facts to a conclusion
Sector
27.10.09
• a region of a circle determined by two radii
and a part of the circle
Translation 28.10.09
• a transformation that moves points the same
distance and in the same direction; a slide
Heptagon
2.11.09
• a polygon having seven sides
Interior Angle 3.11.09
• An angle whose sides are determined by two
consecutive sides of a polygon
Midpoint 4.11.09
• A point that divides a segment or an arc into
two congruent parts
Arc
5.11.09
• A figure consisting of two points on a circle
and all points on the circle needed to connect
them to a single part
• A part of a circle
Apothem 6.11.09
• A segment joining the center of a regular
polygon to the midpoint of one of the
polygon’s sides
Tangent
9.11.09
• A line that intersects a circle at exactly one
point
Frustum 10.11.09
• The part of a solid cone or pyramid formed by
cutting off the top by a plane parallel to the
base
Acute Triangle 11.11.09
• A triangle having three acute angles
Corollary 13.11.09
• A statement that follows directly from another
theorem and that can easily be proved from
that theorem to be true