Many can be washed and reused, and washed again. When they become discolored or crack I pitch them into the recycle bin.
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to construct a triangle, we need 3 parts / elements out of which one should be a side
No it is not possible to draw 1 triangle with 2 right angles because the angles in a triangle should equal to 180 degrees
You need to draw one diagonal. Look at the hexagon and then look at a pentagon. The triangle should stand out pretty well then.
YES!!! An equilateral triangle has three lines of symmetry. They are drawn from any one corner to the opposite base. They should all intersect at the centre of the triangle. By comparison, an Isosceles triangle has only one line of symmetry. From the one unequal angle to the opposite side. Right angled, and scalene triangles do not have lines of symmetry.
An Isosceles triangle has at least one line of symmetry but if it has more than one line of symmetry it can be an Equilateral triangle as well as a Isosceles Triangle. So a triangle with one line of symmetry is always Isosceles and If it has more than one it is always an Equilateral triangle as well as an Isosceles triangle. Example of an Isosceles triangle: