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20 Cards in this Set
- Front
- Back
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Congruent figures
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figures having same size and shape
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median of a triangle
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segment from vertex to the midpt of the opposite side
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altitude of a triangle
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the perpendicular segment from a vertex to the line containt the opposite angle
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perpendicular bisector
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a line (or ray or segment) that is perpendicular to the segment at its midpt
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parolelogram
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a quad with both pairs or opp sides paralel
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rectangle
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a quad with 4 right triangles
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rhombus
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a quad with 4 congruent sides
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square
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a quad wiwth 4 right angles and 4 congruent sides
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median of a trapezoid
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the segment that joins the midpts legs
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ratio
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the ratio of x to y (y cannnot = 0) is x over y OR x:y
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proportion
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equation statin that 2 ratios are equal
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similar polygons
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2 polygons are similar if their vertices can be paired so that correspoiding angles are congruent and corr sides are prop.
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geometric mean
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if a,b,x are posotive numbers with a over x = x over b then x is the geometirc mean between a and b
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sine
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sine of <A = bc over ab
OR sinA = opposite angle over hypotenuse |
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cosine
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cosine of <a = ac over ab
OR cosA = adjecent angle over hypotenuse |
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tangent
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tangent of angle <a = bc over ac
or tan = opposite over adjecent angle |
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Sohcahtoa
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SINE- Opposite over hypotenuse
Cosine- adacent over hypotenuse Tangent= opposite over adjacent |
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3 ways to prove lines parrallel
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1)pair of corr angles are congruent
2)pair of alt int angles are congruent 3)pair or same side int. angles are suppl 4)show that both lines are perp. to a thrid line in a plane 5)show both lines are parr. to a 3rd line |
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3 undefinded terms
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plane, point, line
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3 ways to prove that a quad is a parralelogram
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1)both pairs of opp sides are parr
2)both pairs of opp sides are congruent 3)1 pair op opp sides are congruent and parr 4)both pairs of opp angles are congruent 5)diangonals bisect |
