90 x ((2 x 12) - 4) degrees ie 1800o
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Angles that have a measure sum of 90.
supplementary angles.
The sum of the exterior angles of ANY polygon is 360 degrees.
Complementary angles.
Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.