look in the sky and you will see it
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An inclined plane is just what its name suggests. It is an plane that is inclined (anlged) to be steep. To make an inclined plane, draw a right angle (90 degrees) and connect the two extended lines with a diagonal line. It should look like a triangle.
It intersects the x-y plane along the y-axis, and is at 45° angle to the x-y plane. If you rotate the axes so that x is horizontal, z is vertical, and y is pointing away from you, it will look like the line y = x in the xy coordinate system. See below z | | | |45°angle |/ y----------------x (y-axis is pointing away from you)
A triangle. The effect of turning will depend on whether the plane containing the triangle is rotated - that is, the triangle is rotated around an axis perpendicular to its plane. In that case, it will appear upside down. Alternatively, it can be rotated about an axis in the plane of the triangle. In this case it will appear flipped.
All you do is look at what's closer to plane v so it's XQ or QX
Coplanar means "on the same plane". A plane can be a figure or shape like a rectangle. Coplanar points means points that belong on the same plane.