If the triangle has a 30 degree angle and a 60 degree angle then the 3rd angle must be a 90 degree angle because there are 180 degrees in a triangle and so therefore it is a right angle triangle.
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Yes because 3, 4 and 5 complies with Pythagoras' theorem for a right angle triangle.
Yes
A right angle triangle
any right triangle
Pythagoras' theorem states that: a2+b2 = c2 whereas a and b are the sides of a right angle triangle and c is its hypotenuse