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2 answers:
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Answer:
Let
- p : this triangle has two 45 degree angles
- q : it is a right triangle
Step-by-step explanation:
Denote
- r : if this triangle has two 45 degree angles then it is a right triangle
Then, r can be written as follows
Since is a tautology, you get
and given that
it follows that the negation of r is
- " this triangle has two 45 degree angles and it is not a right triangle".
Then, the correct answer is C.
Answer: The center of the circle is 3+7i
Explanation: Let z1 and z1 be the two end points and c be the center to be determined. The center lies half of the difference between z1 and z1, measured from z1: