### Home > CCG > Chapter 5 > Lesson 5.1.2 > Problem 5-21

5-21.

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).

If a triangle has a

angle, it must be an equilateral triangle. Can a triangle have one

angle and the other angles not be ? 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.

All shapes have

rotation symmetry. What does it mean to have

rotation?