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Home > GC > Chapter 5 > Lesson 5.1.2 > Problem 5-19


Lori has written the conjectures below. For each one, decide if it is true or not. If you believe it is not true, find a counter example(an example that proves that the statement is false).  

  1. If a triangle has a angle, it must be an equilateral triangle.

    Can a triangle have one angle and the other angles not be ?

  2. To find the area of a shape, you always multiply the length of the base by the height.

    How do you find the area of a trapezoid? Think of its formula.

  3. All shapes have rotation symmetry.

    What does it mean to have rotation?