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16 Cards in this Set
- Front
- Back
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Regular polygon |
A 2D shape with equal sides and equal angles. |
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Irregular polygon |
A 2D shape with different sides and different angles. |
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Interior angles |
Angles inside an shape |
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Exterior angles |
Angles outside a shape. All exterior angles of any polygons add up to 360° |
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Sum of interior angles |
(n-2) × 180° n= number of sides of the ploygon |
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Congruent |
Congruent shape are exactly the same shape and size. They have the same area and perimeter. |
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Similar |
If one shape is the enlargement of another, the shapes are similar. The angles in similar shapes are the same. |
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Transformation |
When a shape changes position or size. 4 types of transformations: ~translations ~reflections ~rotations ~enlargement |
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Translations |
A sliding movement. Translations can be described using a vector. Translated shapes are congruent. |
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Vector |
It has a magnitude and a direction. The top number describes the horizontal movement. ~Positive number= move to the right. ~Negative number= move to the left. The bottom number describes the vertical movement ~Positive number= move up |
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Reflections |
Can reflect a shape in a mirror line. To describe a reflection, you need to give the equation of the line. Reflected shapes are congruent. |
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Centre of rotation |
The point around which the object is rotated. This is often the O origin. |
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Angle of rotation |
The number of degrees that something is rotated about a fixed point. It is given as 90° or 180°. |
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Direction of rotation |
This is given as clockwise or anticlockwise. |
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Enlargements |
A transformational shape is made larger (or smaller) without changing its position or direction. To describe an enlargement you need to give the scale factor. |
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Scale factor |
The scale factor of an enlargement tells you how much each length is multiplied by. When the scale factor is between 0 and 1, the new shape is smaller than the original shape. |
