### Home > INT2 > Chapter 5 > Lesson 5.2.5 > Problem5-123

5-123.

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

1. If a triangle has a $60^\circ$ angle, it must be an equilateral triangle.

False. Provide a counterexample.

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

How do you calculate the area of a triangle?

3. All shapes have $360^\circ$ rotation symmetry.

True