Because the 3 interior angles of any triangle always add up to 180 degrees and the sum of 2 obtuse angles would be over 180 degrees
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You can draw a triangle with two obtuse angles in a sphere
No because an equilateral triangle has 3 equal acute angles of 60 degrees
Yes providing its other two acute angles are of different sizes
There's no such thing as an obtuse right triangle ... that's why it's so hard to draw. -- the three inside angles of every triangle add up to 180 degrees; no more, no less -- a right triangle has a right angle in it ... that's 90 degrees -- an obtuse triangle has an obtuse angle in it ... that's more than 90 degrees -- if you had both of them in the same triangle, those two angles alone would add up to (90) plus (more than 90) = more than 180. -- That's impossible. So an obtuse right triangle is impossible.
Yes providing that the other 2 angles are equal acute angles and that the 3 interior angles add up to 180 degrees.