No a quadrilateral does not have any rightangles.
No.
No.
yes they do yes yes, right angles define squares. if they didn't have rightangles they would be a different shape, such as a triangle. how on earth would you need to ask the internet that question? seriously.
Pythagoras was a famous Greek who knew all the rightangles
Pythagoras was a famous Greek who knew all the rightangles
a triangle can have as many midsegments as you put in that particular triangle
What type of triangle?
There are 3 angles in a triangle.
A triangle has no prisms.
A triangle - any triangle - has 3 sides.
3 is how many lines of symmetry a triangle has.