The coordinates of the vertices of a def are d(-4,1), e(3. – 1), and f(-1, – 4)
which statement correctly describes whether a def is a right triangle?
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a def is not a right triangle because no two sides are perpendicular.
a def is a right triangle because de is perpendicular to ef
a def is a right triangle because df is perpendicular to ef
a def is a right triangle because de is perpendicular to df

ΔDEF is not a right triangle because no two sides are perpendicular.

Step-by-step explanation:

The coordinates of the vertices of ΔDEF are given to be D(-4,1), E(3,-1) and F(-1,-4).

Now length of DE is given by units

length of EF is given by units

and length of FD is given by units.

Therefore, 53 ≠ 25+34

Hence, the length of the sides does not support the Pythagoras theorem.

So, ΔDEF is not a right triangle because no two sides are perpendicular. (Answer)

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step-by-step explanation: