Not normally but try drawing a triangle on a spherical shape
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None because a triangle can have only one 90 degree angle
There is only one triangle whose sides have the given values. There can, of course, be countless copies.
An equilateral triangle.
No, because a triangle needs three angles whose sums add up to 180 degrees. Since you already have the 180 degrees in 2 angles there is no room for a third. Without three angles, a shape cannot be a triangle.
The area of triangle is : 90.0