The x-axis and the y-axis should always be perpendicular so that you can express any point in a 2-dimensional plane using an x value and a y value. They are perpendicular so that using them and visualizing is easier, so that x values have no impact on y values and vice versa, and so that formulas like the distance formula can be used. In general, right angles are much easier to work with than oblique or acute angles.
Nope. It is complementary angles that add to 90 degrees.
x0 and y0 aren't lines. Do you mean x=0 and y=0? If so, they are the y axis and the x axis, respectively, and the answer is 90 degrees as noted above.
always 90 degrees
A right angle
There's always an angle that is 90 degrees
It probably wouldn't be habitable, if the Earth's axial "tilt" were 90 degrees.
Uranus.
No. in a rhombus the angles are not 90 degrees. also in a parallelogram they are not 90 degrees
It is the horizontal number line that intersects the y axis at 90 degrees on the Cartesian plane
At the point where the x and y axis intersect at 90 degrees.
Uranus.
a line which is drawn parallel to either of axis makes 90 degree with other axis
the degree of a right angle will always be 90 degrees.
It's the horizontal line on the Cartesian plane that meets the y-axis at the origin at 90 degrees.
if the axis is over 90 degrees to the norh as it is in the summer
Uranus is the planet that is almost tilted 90 degrees on its axis. Its extreme axial tilt results in the planet's poles being almost in line with its orbital plane, causing highly unusual seasons and weather patterns on Uranus.
You don't, 90 degrees will always be measure in degrees