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The longest chord passes through the centre of the circle (view source)
Revision as of 17:57, 4 December 2013
, 17:57, 4 December 2013no edit summary
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===Learning objectives===
===Learning objectives===
# The students should learn that a quadrilateral ABCD is called cyclic if all four vertices of it lie on a circle.
# The students should learn that a quadrilateral ABCD is called cyclic if all four vertices of it lie on a circle.
−# The sum of either pair of opposite angles of a cyclic quadrilateral is 180 degrees.
+# They should know that in a cyclic quadrilateral the sum of opposite interior angles is 180 degrees.
# If the sum of a pair of opposite angles of a quadrilateral is 180, the quadrilateral is cyclic.
# If the sum of a pair of opposite angles of a quadrilateral is 180, the quadrilateral is cyclic.
−# In a cyclic quadrilateral the exterior angle is equal to interior opposite angle
===Notes for teachers===
===Notes for teachers===
*Activity No #Cyclic quadrilateral
*Activity No #Cyclic quadrilateral