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The other acute angle in that triangle is 40 degrees.
180 degrees in a triangle 180 - 90 - 55 = 35 35 degrees
A right triangle
These are the degrees of each angle. It is a right triangle, and it also is an isosceles triangle.
70 degreesA right triangle has a right angle that measures 90 degrees, and the total number of degrees in a triangle is 180 degrees.180 - 90 leaves 90 for the other two, and 90 - 20 = 70