It is a right angle triangle because the 3rd angle is 90 degrees
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a triangle that has a right angle and the other two angles are diffrent ex: angles= #1. 90 degrees/#2. 35 degrees/#3. 55 degrees
cos(35)sin(55)+sin(35)cos(55) If we rewrite this switching the first and second terms we get: sin(35)cos(55)+cos(35)sin(55) which is a more common form of the sin sum and difference formulas. Thus this is equal to sin(90) and sin(90)=1
55 degrees because there are 180 degrees in a triangle
The sum of two complements is 90 degrees, or a right angle. 90-35=55 degrees.
A pair of complementary angles sum up to 90 degrees. In this instance, the complement of a 55-degree angle is 90 - 55 = 35 degrees.