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If you are talking about 9cm, 9cm and 1cm then yes it can form a triangle because this would be an isosceles triangle. The two longer sides add up to longer than the short side so it can be a triangle.
Any three angles that sum to 180 can form a triangle.
Three equal sides in the form of an equilateral triangle and two equal sides in the form of an isosceles triangle
The hypotenuse of a 30-60 right triangle if the short leg is 2992 is: 5984
False: A triangle will only tessellate if it's in the form of an equilateral triangle.