It is not possible in plane Euclidean geometry, but always true on a convex curved surface such as the face of the Earth.
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180 degrees because the 4 interior angles of a quadrilateral add up to 360 degrees and the 3 interior angles of a triangle add up to 180 degrees
That's an impossibility because the 3 interior angles of any triangle add up to 180 degrees and the two given angles are greater than 180 degrees.
180 degrees
180 degrees
It can. An example of an isosceles triangle without any angles greater than 90 would be an equilateral triangle, with all angles equalling 60 degrees. An example with an angle greater than 90 would be a triangle with angles of 100 degrees, 40 degrees and 40 degrees. You couldn't have an isosceles triangle with 2 angles greater than or equal to 90, as all the angles sum to 180 degrees.