Let = 〈−2,−1〉 and = 〈−4, 3〉, find −. a) 〈−6, 2〉 b) 〈−3,−1〉 c) 〈2,−4〉 d) 〈−2, 4〉
1 answer:
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Answer:
C.
Step-by-step explanation:
Recall that the sum of the (3) interior angles of a triangle <em>must</em> equate to 180.
In other words:
Where x is our unknown angle. So, we need to solve for x.
On the left, add 55 and 20:
Subtract 75 from both sides. The left side cancels:
Therefore, the third angle is 105 degrees.
Our answer is C.