Mathematics
If the diagonals of a square ABCD intersect each other at O, then △OAB is
an equilateral triangle
a right angled but not an isosceles triangle
an isosceles but not right angles triangle
an isosceles right angled triangle.
Rectilinear Figures
Answer
Since, diagonals of square bisect each other at 90°.
In △OAB,
AO = OB and ∠AOB = 90°.
Hence, it is an isosceles right angled triangle.
Hence, Option 4 is the correct option.
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