Question

What degree of rotation is this? (GHI —> JKL)

Answer 1

180°

Explanation:

You want the angle of rotation that maps ∆GHI to ∆JKL, given G(-4, 1) and J(4, -1).

Angle of rotation

The angle of rotation can be found by measuring the angle between segments from the origin to corresponding points on the figure and its image.

Here, the segment from the origin to G is in the opposite direction of the segment from the origin to J. When rays are in opposite directions, they form an angle of 180°.

Figure JKL is rotated 180° from figure GHI.

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