Multiple Choice Question (MCQ)

What is the area of a triangle with vertices (1,1), (3,1), and (5,7)?

  1. 6

  2. ×

    7

  3. ×

    9

  4. ×

    10

  5. ×

    12

Collected in the board: Coordinate geometry

Steven Zheng posted 2 months ago


Answer

  1. Plot the triangle as description. It turns out the triangle is an obtuse triangle.

    Make the perpendicular line from the vertex (5,7) to the base.

    The area of the triangle is,

    A = \dfrac{1}{2}bh= \dfrac{1}{2}\times2\times 6=6

Steven Zheng posted 2 months ago

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