# What is the area of a triangle with sides of length 4, 2, and 9?

##### 1 Answer

Jan 27, 2016

First **check** to see if this is a **valid triangle** ...

#### Explanation:

Using the **Triangle Inequality Theorem** ...

**The sum of two sides must always be greater than the 3rd side** .

Unfortunately, this problem does **not** meet the criteria:

**This is not a triangle** , so the area can not be calculated.

Hope that helps