1 Answer

SNash · Answer 1 · 2019-09-17T22:30:46+0000

Angle QRT is supplementary to angle SRT, so they add up to 180, so angle SRT's measure is 180-9x

From there you can add up all three angles inside the triangle and set them equal to 180

so
(180-9x) +

Combine like terms and solve for x ⇒ x=3

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