In a parallelogram the opposite sides and opposite angles are equal. The diagonals of a parallelogram bisect each other.

**Geometry**

**Points to Remember**

**• **In a parallelogram the opposite sides
and opposite angles are equal

**• **The diagonals of a parallelogram bisect
each other.

**• **The diagonals of a parallelogram divides
it into two congruent triangles

**• **A quadrilateral is a parallelogram if
its opposite sides are equal .

**• **Parallelogram on the same base and between
same parallel are equal in area.

**• **Triangles on the same base and between
same parallel are equal in area.

**• **Parallelogram is a rhombus if its diagonals
are perpendicular.

**• **There is one and only one circle passing
through three non-collinear points.

**• **Equal chords of a circle subtend equal
angles at the centre.

**• **Perpendicular from the centre of a circle
to a chord bisects the chord.

**• **Equal chords of a circle are equidistant
from the centre.

**• **The angle substended by an arc of a circle
at the centre is double the angle subtended by it at any point on the remaining
part of the circle.

**• **The angle in a semi circle is a right
angle.

**• **Angles in the same segment of a circle
are equal.

**• **The sum of either pair of opposite angle
of a cyclic quadrilateral is 180o.

**• **If one side of a cyclic quadrilateral
is produced then the exterior angle is equal to the interior opposite angle.

Tags : Geometry | Maths , 9th Maths : UNIT 4 : Geometry

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9th Maths : UNIT 4 : Geometry : Points to Remember | Geometry | Maths

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