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
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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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