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#8)  yes. Two lines can only be non-intersecting if their slopes are exactly the same (otherwise they'd have to cross at some point). So the two lines can only be parallel because they never cross and move with the same slope.

Step-by-step explanation:

#10) A) Right angles

B) straight angle

#11) rhombus

#12) Isosceles triangle: 2 sides equal. Equilateral triangle is also isosceles because it has at least 2 sides equal. But isosceles triangle is not equilateral because it doesn't have 3 sides equal.