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Quadrilaterals
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Revision as of 07:38, 16 December 2013
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07:38, 16 December 2013
→Concept # 2.Properties of quadrilaterals
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# There are certain characteristic properties by which a quadrilateral is identified.
# There are certain characteristic properties by which a quadrilateral is identified.
# A quadrilateral is a plane closed figure having 4 sides and 4 angles.
# A quadrilateral is a plane closed figure having 4 sides and 4 angles.
−
# The sum of all 4 angles of any quadrilateral always equals to 360 degrees.
+
# The sum of all 4
interior
angles of any quadrilateral always equals to 360 degrees
.This is called interior angle sum property of a quadrilateral.
+
# The sum of all 4 exterior angles of any quadrilateral equals 360 degrees. This is called exterior angle sum property of the quadrilteral
.
# The opposite angles of any quadrilateral are supplementary.
# The opposite angles of any quadrilateral are supplementary.
# If any 3 angles of a quadrilateral are known the fourth angle can be found using angle sum property.
# If any 3 angles of a quadrilateral are known the fourth angle can be found using angle sum property.
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