# If the non-base angle of angle of anisosceles triangle has a measure of 70o, what is themeasure of each base angle How many diagonals does a decagon have?

If the non-base angle of angle of anisosceles triangle has a measure of 70o, what is themeasure of each base angle?
How many diagonals does a decagon have?
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Marisa Colon
The sum of angles in any triangle is equal to 180 degrees. The two base angles are going to be equal in an isoscelestriangle.
Therefore 180-70 = 110
110 / 2 = 55 degrees
The number of diagonals in a polygon can be determined by theequation 1/2 * n * (n - 3) with n being the number of sides of saidpolygon. Therefore:
1/2 * 10 * (10 - 7) = 35