- A9
- B12
- C18
- D15
Step-by-Step Solution
A quadrilateral needs two of the 3 flat lines (2 parallels + base), ways, and two of the 4 lines from the apex, ways: .
Answer: C) 18
A triangle has two lines from its apex to the base and two lines parallel to the base. How many quadrilaterals are there?
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