SCALENE because the sides are irregular
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if a triangle is acute, then the triangle is equilateral
No. Because two are triangles and three are rectangles. A triangle cannot be congruent to a rectangle!
no. In fact a right angled triangle cannot be equilateral. An equilateral triangle is also equiangular: that is, all its angles are equal. The sum of all three angles of a [plane] triangle must be 180 degrees and so they cannot be 90 deg each.
Use three sticks to form a triangle. Use the other three sticks to form an inverted triangle and place it on top of the first. You will have two large triangles and six small ones - eight triangles in all. The shape is also known as the Star of David.
Only if they are in the form of an isosceles or an equilateral triangle.