# The triangle 5

The triangle below has vertices A(-1,-2), B(2,2), and C(-1,4). What is the area of △ABCin square coordinate units?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**geometry**- analytic geometry
**combinatorics**- combinatorial number
**arithmetic**- square root
**planimetrics**- right triangle
- area of a shape
- Heron's formula
**numbers**- fractions

#### Units of physical quantities:

#### Grade of the word problem:

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