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43 Cards in this Set
- Front
- Back
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Ratio |
comparison of two numbers |
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similarity |
exact same shape but different sizes geometric |
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geometric mean |
two positive values a and b |
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scale factor |
ratio comparing 2 figures |
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right triangle |
a triangle that forms a 90 degree angle |
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angle of elevation |
the angle that happens between the horizon and the object your looking at; always formed in right triangles |
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angle of depression |
angle between the horizontal and the line of sight to an object beneath the horizontal. |
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SOH |
sine = opposite/hypotenuse |
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CAH |
cosine = adjacent/hypotenuse |
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TOA |
tangent = opposite/adjacent |
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transformations |
a change in size and shape of a figure |
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reflections |
transformations across a line, known as the line of reflection |
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translations |
points of the figure are moved the same distance in the same direction |
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rotations |
a transformation that turns a figure around a fixed point |
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tessellations |
an arrangement of shapes closely fitted together
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glide reflections |
translation followed by a reflection |
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dilations |
transformation that changes size but not the shape |
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circle |
set of all points in a plane that are equidistant from a given point |
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pi |
3.14159265359 |
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radius |
distance from the center to a point on the circle |
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arc |
part of the circumference of a circle or other curve |
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concentric |
circles, arcs, or other shapes that share the same center, the larger often completely surrounding the smaller
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chord |
a segment whose endpoints are points on the circle |
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diameter |
distance across the circle through the center; a chord that passes through the center of a circle |
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point of tangency |
the point at which a tangent line touches the circle |
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major arc |
between 180 degrees and 360 degrees |
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minor arc |
less than 180 degrees; labeled by two letters |
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semicircle |
an exact 180 degree arc |
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tangent line |
a line in the plane that intersects the circle in exactly one point |
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secant line |
a line that intersects a circle in two points |
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central angle |
vertex of a central angle is the center of the circle
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inscribed angle |
vertex sits on the circle and the sides are two chords |
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circumscribed circle |
a circle which passes through all the vertices of the polygon |
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composite figure |
composed or made of figures put together |
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cylinder |
bases are circles |
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prism
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a 3D solid with polygons for its faces and two bases |
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pyramid |
one base and congruent lateral faces that are triangles |
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cube |
all faces are squares |
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sphere
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has no faces, sides, or bases |
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hemisphere |
half a circle |
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cone |
base is a circle |
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volume |
the amount of space that a substance or object occupies |
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surface area |
the area of an outer part or uppermost layer |
