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Is a right triangle a quadrilateral?
No. Quadrilateral means "four sides." Triangles have three sides.
A squashed square.It has four equal sides but no right angles?
A quadrilateral with four equal sides but no right angles is a rhombus.
Will a pattern of right triangles and squares tessellate?
Yes. Consider the situation when: the right-angled triangles are also isosceles and the hypotenuse (longest side) of the triangles is equal to the side of the square. If you surround a square with four of right-angled triangles (the sides of the square being in contact with the hypotenuses of the triangles), you get a larger shape which is also a square. Taking this as a basic unit, you can make a tesselations. You can also make tessalations if you have two sets of squares, one with sides the same length of the hypotenuse of the triangles and one with sides the same length as the smaller sides of the triangles.
Does a parallelogram with 4 equal sides and 2 parallel sides have right angles?
Yes because it has four egual right angles if it has four equal sides.
Does a rectangle have four equal sides and four right angles?
four equal angles
