# In ∆ABC the coordinates vertices A and B are A (-2, 4) and B (-1, 1). For each of the given coordinates of vertex C, is ∆ ABC a right triangle?

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C(-2, 1)

C(0,4)

C(2,2)

C(-2, 1)

C(0,4)

C(2,2)

##### 1 Answer

The only right triangle is

#### Explanation:

The triangle will be a right triangle if either dot-product is zero:

Not a right triangle.

Not a right triangle.

This is a right triangle.