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From Karnataka Open Educational Resources
A Trapezium and its properties (view source)
Revision as of 20:54, 17 December 2013
, 20:54, 17 December 2013→Activity No #
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===Notes for teachers===
===Notes for teachers===
−===Activity No # ===
+===Activity No # Construct an isosceles trapezium and study its properties ===
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|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
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|}
−*Estimated Time
+*Estimated Time: 40 minutes.
−*Materials/ Resources needed
+*Materials/ Resources needed: Laptop, geogebra file, projector and a pointer.
*Prerequisites/Instructions, if any
*Prerequisites/Instructions, if any
−*Multimedia resources
+# The students should know the concepts of parallel lines, perpendicular lines and rectangle.
+# They should know basic constructions like parallel lines and perpendicular lines.
+*Multimedia resources: Laptop.
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
−*Process/ Developmental Questions
+*Process:
+# Construct AB.
+# Construct the midpoint C of AB.
+# Construct a line through point C perpendicular to AB.
+# Construct AD.
+# Mark the perpendicular line as a mirror, then reflect AD and point D.
+# Construct DD'.
+# Hide the perpendicular line and midpoint C.
+# Drag points A, B, and D to make trapezoids of different sizes and shapes. Make sure you note when your trapezoid turns into a rectangle.
+# Based on your construction, describe the symmetry of an isosceles trapezoid.
+# Measure the four angles in your trapezoid. 10. Drag the vertices of the trapezoid and observe your angle measures.
+# Make a conjecture about the base angles of an isosceles trapezoid. (Both of the parallel sides are considered bases, so a trapezoid has two pairs of base angles.)
+*Developmental Questions
*Evaluation
*Evaluation
*Question Corner
*Question Corner
