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104_G6U13_TG 2014.4.17 6:55 PM ˘ ` 186
Activity 2 Similar Figures
jOb ective Learn to recognize and work with similar figures.
1. Textbook Instructions Activity 2 Similar Figures
In this activity students learn to recognize and 1 . Two figures that have the same shape are called similar figures.
perform basic operations involving similar
figures. Draw a similar figure for each shape on the grid.
a.
1. The problem set calls for students to draw
similar figures, scaled up or down. Introduce b.
the formal concept of similar figures,
emphasizing that it means more than the Two figures are
everyday concept of “similar” – not just
roughly the same shape, but differing only in c . considered
scale or orientation.
similar when they are
Problems 1a and 1b are best solved by congruent or when
halving the size of the figure; problems one figure is enlarged
1c and 1d are best solved by doubling the
size of the figure. or reduced by a
certain ratio, but has
Problems 1c and 1d have adjacent sides at
an angle, making the plotting process more the same shape.
challenging.
d.
112
2. Build Understanding
To solve these problems, begin with an orthogonal line in the source figure (either horizontal or vertical will
do), and draw a line in the right general part of the provided space of the desired length – either double or
half the length of the source line.
Then fill in the other lines, working around the figure in either direction. If a line is at an angle, be sure to
make the desired scale adjustment to both the horizontal and vertical offsets.
186 NUMINO Teacher s Guide
Activity 2 Similar Figures
jOb ective Learn to recognize and work with similar figures.
1. Textbook Instructions Activity 2 Similar Figures
In this activity students learn to recognize and 1 . Two figures that have the same shape are called similar figures.
perform basic operations involving similar
figures. Draw a similar figure for each shape on the grid.
a.
1. The problem set calls for students to draw
similar figures, scaled up or down. Introduce b.
the formal concept of similar figures,
emphasizing that it means more than the Two figures are
everyday concept of “similar” – not just
roughly the same shape, but differing only in c . considered
scale or orientation.
similar when they are
Problems 1a and 1b are best solved by congruent or when
halving the size of the figure; problems one figure is enlarged
1c and 1d are best solved by doubling the
size of the figure. or reduced by a
certain ratio, but has
Problems 1c and 1d have adjacent sides at
an angle, making the plotting process more the same shape.
challenging.
d.
112
2. Build Understanding
To solve these problems, begin with an orthogonal line in the source figure (either horizontal or vertical will
do), and draw a line in the right general part of the provided space of the desired length – either double or
half the length of the source line.
Then fill in the other lines, working around the figure in either direction. If a line is at an angle, be sure to
make the desired scale adjustment to both the horizontal and vertical offsets.
186 NUMINO Teacher s Guide
