(2, -2), (8, 4) and (5, 7), the coordinates of the fourth vertex are

a. (1, 1)

b. (1, -1)

c. (-1, 1)

d. None of these

Answer-c. (-1, 1)

2. If the vertices of a triangle have integral coordinates, then the triangle is

a. Equilateral

b. Never equilateral

c. Always isoceles

d. None of these

Solution- An irrational number can't be equal to a rational number.

Hence a triangle with coordinates of the vertices as integers can't be

an equilateral triangle.

Answer- b. Never equilateral