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Line 19:
Line 19: + + + − # Sum of the angle at the centre of circle and at external point is supplementary. Sum of opposite angles=180°
Construction of tanget to a circle and its properties (view source)
Revision as of 07:46, 28 August 2020
, 07:46, 28 August 2020no edit summary
# With CO or CP as radius draw a circle to intersect the circle already drawn mark and name the intersecting points Q and R.
# With CO or CP as radius draw a circle to intersect the circle already drawn mark and name the intersecting points Q and R.
# Join PQ and PR. PQ and PR are the required tangents.
# Join PQ and PR. PQ and PR are the required tangents.
# Measure PQ and PR. What is your conclusions?
# Length of tangents from an external point are equal i.e. length of tangent PQ is equal to length of tangent PR
# Length of tangents from an external point are equal i.e. length of tangent PQ is equal to length of tangent PR
# Join OQ and OR, find angles QPR and ROQ.
# Sum of the angle at the centre of circle and at external point is supplementary. Sum of opposite angles=180°
# Move slider or point P to verify the properties
# Move slider or point P to verify the properties
=== Evaluation at the end of the activity ===
=== Evaluation at the end of the activity ===