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what is Congruent Shapes?
two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other.

an example can be a freewheel

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what is lines?
a long, narrow mark or band.
an example is this picture below

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what is reflection?
reflection is a type of rigid transformation in which the pre-image is flipped across a line of reflection to create the image.

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what is a sphere?
a round solid figure, or its surface, with every point on its surface equidistant from its center.
the picture below is ans example

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What is an obtuse angle ?
The obtuse angle is the smaller angle. It is more than 90° and less than 180°.
An example can be a clock.

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what is a Pyramid?
Its is a structure with a square or triangular base and sloping sides that meet in a point at the top
an example is a pyramid

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what is dilation?
it is the action or condition of becoming or being made wider, larger, or more open
the picture below is dilation

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what is a vertical angles ?
its is each of the pairs of opposite angles made by two intersecting lines.

an example can be a  crossing sign

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what is a regular polygon?
is a polygon that is quadrangular (all angles are equal in measure) and equilateral (all sides have the same length).
An example oh a regular polygon is a turtle shell

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what is a prism ?
a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.
An example of a prism is a cereal box