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Activity 2 Rhombus 10Transformations of Quadrilaterals Unit
jOb ective Learn about and understand rhombuses and their properties.
Activity 2 Rhombus 1. Textbook Instructions
1 . Push one corner of a square to change its shape. Students will learn about rhombuses.
What you need: Anglegs
A quadrilateral with 4 equal 1. First have the students take four Anglegs of
sides, 4 right angles, and the same type to make a square. Have
2 pairs of parallel sides is them observe the changes when one
called a square. corner is pushed down .
A quadrilateral with 4 equal Find the similarities between the original
sides and 2 pairs of parallel square and the new figure created.
sides is called a rhombus. Side length: The length of all four sides on
both figures are equal.
What shape is made by pushing one corner of the square? Number of opposite sides that are parallel:
Explain why you think so. Both figures have two pairs of opposite
sides.
A rhombus is made by pushing one corner of the square. When the corner is pushed,
the lengths of the sides remain the same. So all four sides are equal. Both figures have two pairs of opposite
Also, a parallelogram can be made by pushing one corner of the rectangle. sides that are parallel and sides that are all
equal.
10. Transformations of Quadrilaterals 87
Tell the students that a quadrilateral that
has two pairs of opposite sides and with all
sides equal is called a rhombus.
Have the students find the differences in
the two figures.
Refer to .
2. Build Understanding
Differences when a square is made into a rhombus
The angles in the original square are all right angles. When one corner is pushed down, the angles become
either greater than or less than 90 . The new figure does not have any right angles.
ad a' Angles a and c The angles that were 90 ,
are greater than 90 in the new figure.
b' d' Angles b and d The angles that were 90 ,
bc are less than 90 in the new figure
c'
4A Unit 10 143
Activity 2 Rhombus 10Transformations of Quadrilaterals Unit
jOb ective Learn about and understand rhombuses and their properties.
Activity 2 Rhombus 1. Textbook Instructions
1 . Push one corner of a square to change its shape. Students will learn about rhombuses.
What you need: Anglegs
A quadrilateral with 4 equal 1. First have the students take four Anglegs of
sides, 4 right angles, and the same type to make a square. Have
2 pairs of parallel sides is them observe the changes when one
called a square. corner is pushed down .
A quadrilateral with 4 equal Find the similarities between the original
sides and 2 pairs of parallel square and the new figure created.
sides is called a rhombus. Side length: The length of all four sides on
both figures are equal.
What shape is made by pushing one corner of the square? Number of opposite sides that are parallel:
Explain why you think so. Both figures have two pairs of opposite
sides.
A rhombus is made by pushing one corner of the square. When the corner is pushed,
the lengths of the sides remain the same. So all four sides are equal. Both figures have two pairs of opposite
Also, a parallelogram can be made by pushing one corner of the rectangle. sides that are parallel and sides that are all
equal.
10. Transformations of Quadrilaterals 87
Tell the students that a quadrilateral that
has two pairs of opposite sides and with all
sides equal is called a rhombus.
Have the students find the differences in
the two figures.
Refer to .
2. Build Understanding
Differences when a square is made into a rhombus
The angles in the original square are all right angles. When one corner is pushed down, the angles become
either greater than or less than 90 . The new figure does not have any right angles.
ad a' Angles a and c The angles that were 90 ,
are greater than 90 in the new figure.
b' d' Angles b and d The angles that were 90 ,
bc are less than 90 in the new figure
c'
4A Unit 10 143
