scalene triangle
A parallelogram.
If a shape has four sides and you know that it has one right angle, yet you do not know anything else about the shape, then the most specific geometric term you can assign to the shape is "quadrilateral". Unless you know about the other angles and side lengths, nothing more can be said.
A right angle triangle
No because a triangle has three sides and triangle's are shape different.
There is no such thing as an equilateral angle. Equilateral refers to a shape whose sides are of equal length. The lengths of the sides of an angle are indeterminate.
A rectangle is a 2D shape that has 2 sides and 2 ends of different lengths, with a right-angle in each corner.
A right trapezoid.
A parallelogram.
Isosceles triangle.
right angled triangle
a 3 sided shape is a right angle triangle
A right angle triangle
an angle with a acute and right angle
If a shape has four sides and you know that it has one right angle, yet you do not know anything else about the shape, then the most specific geometric term you can assign to the shape is "quadrilateral". Unless you know about the other angles and side lengths, nothing more can be said.
A right angle triangle
You cannot. The arms of an angle are of unspecified lengths and the shape is not closed so there is no finite area to find.
If it contains a 90 degree angle and two acute angles that add up to 90 degrees then it is a right angle triangle.