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A hexagon or pentagon will have obtuse angles (greater than 90 degrees). A triangle has angles that are all less than 90 and a square has only 90.
Because it has 4 equal right angles and 4 equal sides
Equilateral triangles have three 60' angles, and the angles of any triangle always add to 180'. Attaching squares to each side of an equilateral triangle would also form three obtuse angles (360' - 90'- 90' - 60' = 120') and the resultant obtuse Isosceles triangles' hypotenuses would be greater in length than any side of the square since its two equal sides are the same length as the square. However, the angles of any corner of the newly formed hexagon would be 90' from the square plus 30' (30' = (180' - 120')/2) from the obtuse triangle, making this hexagon equiangular, but not equilateral. JCS
Any polygon called "regular" or "equilateral" will have congruent sides and angles. An equilateral triangle, a square, and a regular hexagon are examples.
square has 4 right angles and triangle has no right angles
A hexagon or pentagon will have obtuse angles (greater than 90 degrees). A triangle has angles that are all less than 90 and a square has only 90.
Triangle: The other shapes have an even number of sides. Square: The numbers of sides on the other two is divisible by 3 Hexagon: For sides of a fixed length, the other two shapes are rigid structures (the square can distort to a rhombus but then it is no longer a square.) or Triangle: It can have all acute angles. Square: It can (must ) have all right angles. Hexagon: It can have all obtuse angles.
Because it has 4 equal right angles and 4 equal sides
Equilateral triangles have three 60' angles, and the angles of any triangle always add to 180'. Attaching squares to each side of an equilateral triangle would also form three obtuse angles (360' - 90'- 90' - 60' = 120') and the resultant obtuse Isosceles triangles' hypotenuses would be greater in length than any side of the square since its two equal sides are the same length as the square. However, the angles of any corner of the newly formed hexagon would be 90' from the square plus 30' (30' = (180' - 120')/2) from the obtuse triangle, making this hexagon equiangular, but not equilateral. JCS
triangle
Any polygon called "regular" or "equilateral" will have congruent sides and angles. An equilateral triangle, a square, and a regular hexagon are examples.
Square
square has 4 right angles and triangle has no right angles
Why
hexagon
Many shapes circle, equalateral triangle, square, and all normal shapes from then on such as pentagon and hexagon etc.
The first step when inscribing a square quadrilateral triangle or a hexagon in a circle is to connect the endpoints of the diameters to form a square.