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The measure of arcSTU is 210 degrees

For the first question, we will use the theorem that states that the angle at the center of a circle is twice the angle at the circumference

  • m<STU = 1/2 arcSTU

Given the following

m<STU = 105 degrees

Substitute to have:

105 = 1/2 arcSTU

arcSTU = 2(105)

arcSTU = 210 degrees

Hence the measure of arcSTU is 210 degrees

Learn more on circle theorems here: https://brainly.com/question/10136582

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