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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.
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Earn +20 ptsQ: Why should x and y axis always be in 90 degrees?
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Continue Learning about Math & Arithmetic
Congruent angles always add up to 90 degrees?
Nope. It is complementary angles that add to 90 degrees.
What is the angle between the two lines x0 and y0?
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.
What is the degree of the perpendicular lines?
always 90 degrees
What angle is always 90 degrees?
A right angle
What is always true about a right triangle?
There's always an angle that is 90 degrees
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