Geometry Instrument


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.Parallegram

A quadrilateral whose opposite sides are parallel is called a Parallegram. Properties of a parallelogram *Opposite sides of the parallelogram are equal. *Opposite angle of the parallelogram are equal. *The diagonals of the parallelogram bisect each other (I) Rectangle: Rectangle is a types of parallelogram but parallelogram is not rectangle because all angle of rectangle equal each other or all angle of rectangle equal to 90 degree. The diagonals of rectangle are equal. (II) Square: Square also a types of parallelogram but parallelogram and rectangle are not square because all side and angles of square are equal to each other. The diagonals of square are equal.
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Angle

(I) Angle formed by intersection each other lines -Vertical opposite angle - Adjecent angle Straight angle -Complementary angles -Supplementary angle (II) Angle formed by a transversal with the parallel lines -Alternative angles When a transversal cuts a pair of lines then, *Both interior *Both non adjacent *Both either side (II) Co-interior angle when a transversal line cuts a pair of lines then the interior angles on the same side of the transversal are called co-interior or consecutive interior angles. (III) Corresponding angle If a pairs of lines is intersected by a transversal line, then the pair of non adjacent interior and exterior angle formed on the same side of it are called corresponding angles.
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