If a triangle has equal sides, it will have equal angles of 60 degrees. It is called an equilateral triangle.
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The minimum length possible is 18. The maximum is 38.
The formula for finding the length of one of the sides of a right angle triangle is a2+b2=c2, with a and b the legs and c the hypoteneus. If the triangle is Isosceles, which means that 2 of its sides are equal, the length of each leg would be aproximately 7.778184593
A rectangle has 4 sides and the opposite sides are of equal length. You therefore have two sides of length 5 m and two sides of length 11 m. To get the perimeter you add up the length of all the sides. I will leave this last bit for you to do.
To create a triangle, the sum of the two shorter sides must be greater than the third side. If the side of length 11 is the longest side then the missing side must be greater than 11 - 8 = 3 If the missing side is the longest side then the missing side must be less than 8 + 11 = 19 Thus any length that is greater than 3 and less than 19. Examples include: 4, 5, 10, 17
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