There are two types of relationships: supplementary and complimentary. Supplementary angles always add up tp 180 degrees. Complimentary angles always add up to 90 degrees. If you are dealing with complimentary angles, look for a right angle.
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They are all 60 degrees.
Measure the two sides adjacent to the angle and the diagonal at the far ends of these sides. Then use the cosine rule to calculate the angle.
True
an adjacent corresponding angle is an angle which is adjacent to a particular angle as well as corresponding.
true