Angles, Polygons, + Quadrilaterals Flashcards

0
Q

If two lines never cross, they are

A

Parallel

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1
Q

If two lines cross, we say they

A

Intersect

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2
Q

If two lines make corners at the point where they cross, the lines are

A

Perpendicular

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3
Q

Angles made by perpendicular lines

A

Right angles

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4
Q

An angle less than a right angle

A

Acute

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5
Q

Greater than a right angle

A

Obtuse

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6
Q

Degrees in a straight line

A

180

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7
Q

Degrees in a circle

A

360

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8
Q

Polygon with an indention

A

Concave

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9
Q

Polygon with no indention

A

Convex

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10
Q

4 sided figure

A

Quadrilateral

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11
Q

5 sided

A

Pentagon

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12
Q

Six sided

A

Hexagon

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13
Q

Seven sided

A

Heptagon

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14
Q

Eight sided

A

Octagon

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15
Q

Nine sided

A

Nonagon

16
Q

Ten sided

A

Decagon

17
Q

Eleventh sided

A

Undecagon

18
Q

Twelve sided

A

Dodecagon

19
Q

N sided figure

A

N-gon

20
Q

Polygon whose side are equal in length

A

Equilateral

21
Q

Polygon whose angles have equal measure

A

Equiangular

22
Q

Polygon with both equal sides an angles

A

Regular polygon

23
Q

Triangle with one ninety degree angle

A

Right

24
Q

Three angles less than ninety degrees

A

Acute

25
Q

Triangle with one angle more than ninety degrees but less than 180

A

Obtuse

26
Q

Triangle with all angles equal in measure

A

Equiangular

27
Q

Triangle with three sides of equal length

A

Equilateral

28
Q

Two sides of equal length

A

Isosceles

29
Q

No side of equal length

A

Scalene

30
Q

Sum of the angles of any triangle

A

180*