### Home > CCG > Chapter 5 > Lesson 5.1.2 > Problem5-21

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). Homework Help ✎

1. If a triangle has a $60º$ angle, it must be an equilateral triangle.

Can a triangle have one $60º$ angle and the other angles not be $60^{\circ}$?

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 $360º$ rotation symmetry.

What does it mean to have $360º$ rotation?