MATH V

OCAB UNIT

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XI

ACUTE ANGLE

Acute Angle- An angle that measures between 0° and 90.

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ADJACENT ANGLE

Angles that are next to each other; adjacent angles have a common side, but no other overlap.

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ISOSCELES TRIANGLE

A triangle with 2 equal sides.

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CONGRUENT

Having the exact same shape or size.

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RADIUS

A line segment from the center of a circle (or sphere) to any point on the circle (or sphere) also the length of such a line segment.

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RIGHT ANGLE

A 90 angle.

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REFLEX ANGLE

An angle that is more then 180 but less than 360.

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SCALENE TRIANGLE

A triangle with all different sides.

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QUADRANGLE

A polygon with 4 equal sides.

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TESSELLATION

An arrangement of shapes that covers a surface completely without overlaps or gaps also called a tiling.

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OBTUSE ANGLE

An angle from 90 to 180.

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VERTICAL/OPPOSITE ANGLE

When two lines intersect, the angles that do not share a common side. Vertical angles have equal measures.

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POLYGON

A closed 2-dimensionalfigure that Is made up of line segments joined end to end. The line segments of a may not cross.

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PARALLEL LINES

Never meeting always the same distance apart. Lines, line segments, and rays in a plane are parallel if they never meet, no matter how far they are extended.

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STRAIGHT ANGLE

A 180 angle.

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EQUILATERAL TRIANGLE

A triangle with the same length on all sides.

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REGULAR POLYGON

A polygon whose sides are all the same length and whose angles are all equal.

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DIAMETERA line segment that passes

through the center of a circle or a sphere and has end points on the circle or sphere also the length of this line segment. The diameter of a circle or sphere is twice the length of radius.

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See definition for radius slide 6

CREDITS

5th grade math Reference book

Dictionary.comGoogle

Bing images

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