A rectangle.
No. The only requirement for a triangle to be a 45-45-90 triangle is for it to have at least two congruent sides/angles. The measure of the two congruent angles can be anything.
escoscolipse
An Isosceles Triangle
true
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.
the shape? no, not always. but they are always at least similar figures. but the angles alone are always congruent
Yes. The two base angles (the angles opposite the equal sides) are always congruent.
A rectangle or a square.
Adjacent angles of a square? You have to have at least two squares to compare the congruency of angles. Since all the angles of a square equal 90 degrees, adjacent angles of any TWO squares will be congruent. I suggest you look up the definition of CONGRUENT. - wjs1632 -
If it has at least one set of parallel sides, then at least one set of angles are congruent
No. The only requirement for a triangle to be a 45-45-90 triangle is for it to have at least two congruent sides/angles. The measure of the two congruent angles can be anything.
No.
escoscolipse
true
An Isosceles Triangle
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.
A scalene triangle. In a scalene triangle, there are no congruent sides or angles. In an isosceles triangle, at least two congruent sides and angles. In an equilateral triangle, all three sides and angles are congruent, with angles that always measure sixty degrees. Note: an equilateral triangle also classifies as an isosceles triangle, as it meets the definition of an isosceles triangle mentioned above.