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For the triangle whose vertices are at (4, 0), (-1, -1), and (3, 5), the triangle is

1. isosceles and right-angled
2. isosceles but not right-angled
3. right-angled but not isosceles
4. neither right-angled nor isosceles

Correct answer: isosceles and right-angled

Solution

The triangle has two sides of equal length, making it isosceles, and the angles formed by these sides include a right angle, confirming that it is also right-angled.

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