Page 86 - Math Course 2 (Book 2)

Transformations: Rotated Images

• Draw a segment from point R to point A. • Draw GR.

→
• Use a protractor to measure a 45° angle • Use a compass to copy GD onto GR.
counterclockwise with AR as one side. Name the segment GD’.
Extend the other side to be longer than AR.
• Repeat with points E and F.
• Locate point R’ so that AR = AR’.
ΔD’E’F’ is the image of ΔDEF under a 115°
• Repeat this process for points S, T, and V. clockwise rotation about point G.

• Connect the four points to form R’S’T’V’. Answer

Quadrilateral R’S’T’V’ is the image of quadrilateral
RSTV under a 45° counterclockwise rotation about
point A.

S’
T’

V’ S
Answer R’
T
R

A V

Triangle DEF has vertices D(–2, –1), E(–1, 1), and
F(1, –1). Draw the image of DEF under a rotation
of 115° clockwise about the point G(–4, –2). Your Turn!

Draw a Rotation

For the following diagram, which description best
identifies the rotation of triangle ABC around point
Q?

A. 20° clockwise
B. 20° counterclockwise
C. 90° clockwise
D. 90° counterclockwise

• First draw ΔDEF and plot point G.

• Draw a segment from point G to point D.

• Use a protractor to measure a 115° angle
Answer
clockwise with GD as one side.

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