What is the image of the point (−9,1) after a rotation of 90 counterclockwise about the origin?

-3.396 = -3.4

-0.708 = -0.7

0.304 = 0.3

0.955 = 1

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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