It is an acute angle.
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A pair of complementary angles add up to 90 degrees. Therefore, the complement of a 70 degree angle is 90 - 70 = 20 degrees.
Any angle under 90 degrees is an acute angle. Any angle greater than 90 degrees and less than 180 is an obtuse angle. So a 50 degree angle would be an acute angle.
45 degree angle
Complementary angles are angles that add up to 90 degrees. So, the complementary angle of 70 degrees would be 20 degrees
The sum of the angles is 180 degrees in any triangle. So 180-140 is 40 and the third angle is 40 degrees.