Geometry
PIN number: FSOVXH

L6555 Exploring angles
 Published 01/03/2016
 TLFID L6555
Resize a triangle by moving its vertices. Notice that the sum of the three interior angles is always 180 degrees. Watch a video showing how angles are used in designing and riding bicycles.
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L6558 Exploring triangles
 Published 04/03/2016
 TLFID L6558
Find an active triangle in a photograph. Work out its angles by applying principles of opposite angles, complementary angles, supplementary angles and the sum of interior angles. Watch a video showing how triangles are used in buildings and other structures.
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L6554 Exploring relationships of angles
 Published 05/04/2016
 TLFID L6554
Explore angles formed by a transversal line intersecting parallel lines. Look at illustrations showing pairs of angles: vertically opposite, corresponding and alternate angles. Name pairs of angles to score points and help a monkey drive to the supermarket to buy food.
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L6562 Exploring quadrilaterals
 Published 01/03/2016
 TLFID L6562
Examine the sides and angles of a foursided shape. Identify its geometric properties such as the number of sides of equal length. Classify the shape as a parallelogram, rhombus, square, rectangle, kite or trapezium. Notice that some quadrilaterals can be classified in different ways.
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L2327 Trigonometry: similar triangles
 Published 10/04/2020
 TLFID L2327
Examine pairs of rightangled triangles. Check that each pair of triangles is similar by identifying all three pairs of corresponding angles. Label corresponding angles with matching symbols. This learning object is one in a series of ten objects.
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L3517 Congruent triangles
 Published 15/03/2016
 TLFID L3517
Find out about congruent and noncongruent triangles and the conditions required to make them. Use line segments and angles to build two congruent triangles for three different combinations of sides and angles. Explore the SSS case (side, side, side), the SAS case (two sides and the included angle) and the ASA case (two angles and the included side) by forming two triangles and then using the rotation function to test them for congruency. Examine the SSA condition (two sides and an angle opposite one of them, often called the Ambiguous Case), and determine the conditions needed to form noncongruent triangles. This resource requires the current Java Plugin to be installed.
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L8166 Shape sorter: quadrilaterals
 Published 10/04/2020
 TLFID L8166
Help sort shapes in the shape factory. Examine examples of shapes and determine if they belong in the Yes quadrilateral set. Examine examples of shapes that do not belong in the set. Work out what features of the quadrilaterals are important and test your ideas by sorting some shapes. Then program the robot and see if it sorts the shapes into quadrilateral sets correctly. This learning object is the fourth in a series of seven objects.
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