(05.05 MC) what are the measures of angles a, b and c? explain your answer
1 answer:
Check the picture below.
∡a has a vertical angle sibling of 40°, and vertical angles are always congruent.
∡b is the 3rd angle in a triangle, the other two are 40° and 90°, recall all interior angles in a triangle add up to 180°.
∡c is a linear angle, namely an angle on the same flat-line as another, and linear angles always add up to 180°.
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Answer:
and
Step-by-step explanation:
Recall that is a value of the function cosine for the special angles:
and
, then: