ameerhh2004
ameerhh2004 ameerhh2004
  • 03-04-2020
  • Mathematics
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DeanR
DeanR DeanR
  • 03-04-2020

The external angles of a 12-gon add up to 360 degrees so each is 30 degrees.  That makes the internal angle the supplement, PQR=150 degrees.

We have an isosceles triangle so the other two angles add to 30 degrees, so 15 degrees.

Answer: 15 degrees

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