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27 Cards in this Set
- Front
- Back
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Define a triangle.
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>Internal angles total 180 degrees
>3 sides |
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Define an equilateral triangle.
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Equal sides and angles.
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Define an isoseles triangle.
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Two equal sides and two equal angles.
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Define a right angled triangle.
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One angle is a right angle (90 degrees) therefore the other two angles will total 90 degrees.
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Define hypotenuse.
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Longest side.
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Define Pythagoras theorem.
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The square on the hypotenuse is equal to the sum of the squares on the other two sides (a^2 = b^2 + c^2).
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What is Pythagoras theorem used to find?
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An unknown length in a right angled triangle if the other two lengths are known.
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Define an obtuse triangle.
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One angle larger than 90 degrees.
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Define acute triangle.
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All angles are less than 90 degrees.
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Reflex angle is the _____ angle.
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outside
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a = c
d = b a = e a = g c = g |
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Define a quadrilateral.
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>4 sides
>4 angles that total 360 degrees |
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Define square.
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>4 sides same length
>4 angles the same >2 pairs of parallel sides >Diagonals equal length >Diagonals bisect at 90 degrees |
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Define rectangle.
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>2 pairs of sides the same
>4 angles the same >2 pairs of parallel sides >Diagonals equal length >Diagonals bisect |
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Define parallelogram.
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>2 pairs of sides the same
>2 pairs of angles the same >2 pairs of parallel sides >Diagonals of different lengths >Diagonals bisect each other |
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Define Rhombus.
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>4 sides the same
>2 pairs of angles the same >2 pairs of parallel sides >Diagonals different lengths >Diagonals bisect each other at 90 degrees |
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Define Trapezium.
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>One pair of parallel sides.
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Define Kite.
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>2 pairs of sides the same
>1 pair of angles the same >Diagonals are different lengths >One diagonal bisects the other at 90 degrees |
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Define polygon.
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A shape with any number of sides.
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What is the name of a shape with 4 sides?
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Quadrilateral
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What is the name of a shape with 5 sides?
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Pentagon
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What is the name of a shape with 6 sides?
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Hexagon
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What is the name of a shape with 7 sides?
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Heptagon
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What is the name of a shape with 8 sides?
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Octagon
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What is the name of a shape with 9 sides?
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Nonagon
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What is the name of a shape with 10 sides?
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Decagon
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