Yes.
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The triangle with angles measuring 40, 50, and 90 degrees is a right triangle. In a right triangle, one of the angles is always 90 degrees, making it a right-angled triangle. The other two angles are acute angles, measuring less than 90 degrees each. The sum of the interior angles of any triangle is always 180 degrees.
Since a right triangle has 180 degree angles in it, you know 2 angles already. One is the 90 degree angle, since the triangle is a right one. The other is 40 degrees, as in your statement. 90 plus 40 is 130. 50 degrees is the missing angle since 50 + 40+ 90 equal 180 degrees. Hopefully that helped you.
Oh, what a happy little question! Unfortunately, those angles wouldn't make an equilateral triangle, but don't worry, mistakes are just happy accidents in the world of geometry. You'll find the right angles to create a beautiful equilateral triangle with all sides and angles equal in no time. Just keep on painting and exploring, my friend.
An obtuse angled isosceles triangle.
An obtuse angled triangle.