wikiHow Calculating Angles Practice Answers Calculating Interior Angles in a Polygon: 1. The sum of the interior angles in a hexagon is 720 degrees. 2. Each interior angle in a regular pentagon measures 108 degrees. 3. Each interior angle in a heptagon measures 128.57 degrees. 4. Each interior angle in a quadrilateral measures 90 degrees. 5. Each of the remaining interior angles in the octagon measures 135 degrees. 6. The sum of the interior angles in a nonagon is 1260 degrees. 7. Each interior angle in a regular decagon measures 144 degrees. 8. Each of the remaining interior angles in the dodecagon measures 157.5 degrees. 9. Each interior angle in an isosceles triangle with a base angle of 45 degrees measures 67.5 degrees. 10. The measure of each of the remaining angles in the irregular pentagon cannot be determined without more information. Finding Angles in a Right Triangle: 1. Angle A in the right triangle measures 36.87 degrees. 2. Angle A in the right triangle measures 60 degrees. 3. Angle B in the right triangle measures 53.13 degrees. 4. Angle C in the right triangle measures 45 degrees. 5. Angle C in the right triangle measures 63.43 degrees. 6. Angle A in the right triangle measures 30 degrees. 7. Angle A in the right triangle measures 16.26 degrees. 8. Angle B in the right triangle measures 45 degrees. 9. Angle B in the right triangle measures 22.62 degrees. 10. Angle C in the right triangle measures 60 degrees. Page