A square and a rectangle
Any quadrilateral other than a square or kite could have diagonals meeting at 30 degrees.
30 degree angle
Yes.
a 60 degree angle is twice the size of a 30 degree angle.
The takeoff for a 30 degree angle will depend with the offset angle.
Yes and they are both acute angles
a 60-degree angle
staircase is made in an angle of 20 to 30 degree and it shouldn't be more then 30 degree.
If you bisect a 30 degree angle, you end up with two 15 degree angles.
A 30 degree angle is an acute angle because it is greater than 0 but less than 90 degrees.
A 60 degree angle
Two angles that have measures summing to 90 degrees are called complementary angles. For example, a 30-degree angle and a 60-degree angle are complementary because 30 + 60 = 90. Another pair could be a 45-degree angle and a 45-degree angle, which also add up to 90 degrees.