Geometry Guide

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LinesAngles

TrianglesQuadrilaterals

Circles

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PointsLine Segments

RaysLines

Intersecting LinesPerpendicular Lines

Parallel LinesSkew Lines

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A point is a precise location in space. It is labeled with a letter.

Point K

Point L

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Planes are a flat surface and they need to have 3 points.

Point A

Point B

Point C

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A line is a straight never ending thing that goes both ways.

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A line that ends on both sides.

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A line that ends at one point and keeps going on forever on the other side.

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Two lines that meet each other and keep going past each other.

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Two lines that meet in the middle and keep going but in the middle it creates four 90 degree angles.

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Two lines that never touch and go the same way.

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Lines that aren't in the same field

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acuteobtuseright

straightvertex/verticescomplementarysupplementary

vertical/oppositeadjacent

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An angle that is less that is smaller than 90 degrees.

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An angle that is over 90 degrees is the obtuse angle.

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An angle that goes directly 90 degrees.

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A straight line is 180 degrees.

Vertex/Vertices

A vertex is the middle point. Vertices is the plural of vertex.

Vertices

Vertex

Complementary

Two angles that add up to 90 degrees.

75 degrees

15 degrees

Supplementary

2 angles that add up to 180 degrees

80 degrees

100 degrees

Vertical/Opposite

Opposite sides of a shape

Adjacent

Two angles that are next to each other.

Triangles

rightobtuseacute

scaleneisoscelesequilateral

sum of internal anglesperimeter

area

Right

An right angle in one of the angles of a triangle.

Obtuse

An angle of a triangle that's bigger than 90 degrees.

acute

An angle of a triangle that is less than 90 degrees.

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A triangle that has no equal sides.

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A triangle that has two sides that are equal.

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A triangle with all equal sides.

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All of the sides that add up to 180 degrees.

150 degrees

30 degrees

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The length around a triangle

70 degrees 40 degrees

90 degrees

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The area around the triangle.

80 degrees

20 degrees

80 degrees

30 degrees

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quadrilateraltrapezoid

parallelogramrectanglerhombussquare

area of a rectanglearea of a square

area of a parallelogramarea of a trapezoid

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A shape that has 4 sides.

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A shape that has a set of parallel sides.

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A figure with 2 sets of parallel sides.

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A figure with 2 parallel sides and 4 right angles.

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A shape that has two sets of parallel sides and opposite angles.

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A figure that has 4 right angles and 2 sets of parallel sides and equal angles.

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The space in the rectangle.

10 cm

20 cm

10cm

A=240cm2

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The space inside a square.

40cm

40cm

40cm

A=1600cm2

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The space inside a parallelogram.

20m

30m

30m

20m20m

A=600m2

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The space inside a trapezoid

20 cm20 cm

20 cm

30 cm

10 cm

A=200 cm2

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chorddiameter

arcradiussector

circumferencearea of a circle

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A segment connecting 2 points on a circle

Point A

Point B

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The chord which passes through the center.

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Distance on outside edge.

AB

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Half of a diameter.

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A piece of the area.

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Distance around the circle.

C

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The space inside a circle.

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pentagonhexagonoctagon

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A shape that has 5 sides.

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A shape that has 6 sides.

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A shape that has 8 sides.