Practice: Angle Sum of a Triangle

The measures of the base angles of an isosceles triangle are (9𝑚−2𝑛)∘ and (5𝑚+2𝑛)∘, and the measure of the vertex angle is (4𝑚)∘. Find the values of 𝑚 and 𝑛.

  • A𝑚=10, 𝑛=10
  • B𝑚=13, 𝑛=26
  • C𝑚=10, 𝑛=20
  • D𝑚=13, 𝑛=13

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