Q: A line at 90 degrees to a barrier?

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Because 90 degrees is half of a straight line. A straight line is equal to 180 degrees. 180 divided by 2 = 90.

Perpendicular lines meet at 90 degrees

A vertical line at 90 degrees

Construct a perpendicular line that intersects a horizontal line at 90 degrees and then bisect the vertical line with the horizontal line will give an obtuse angle of 135 degrees because 90 degrees+45 degrees = 135 degrees

It is a straight line that intersects another line at 90 degrees

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it is when you get down to the ball at 90 degrees

A line that is at 90 degrees to another line is called a perpendicular line. Perpendicular lines intersect at right angles (90 degrees) forming a "L" shape.

Because 90 degrees is half of a straight line. A straight line is equal to 180 degrees. 180 divided by 2 = 90.

Perpendicular lines meet at 90 degrees

90 degrees 40 degrees and 90 degrees

A vertical line at 90 degrees

It is a line that is not at an angle of 90 degrees to the horizontal!

It is a perpendicular line that intercepts another line at 90 degrees.

Construct a perpendicular line that intersects a horizontal line at 90 degrees and then bisect the vertical line with the horizontal line will give an obtuse angle of 135 degrees because 90 degrees+45 degrees = 135 degrees

Obtuse Yes, For a line set that has an angle greater than 90 degrees, the line set is "OBTUSE". For a line set that has an angle less than 90 degrees, the line set is "ACUTE". For a line set that has an angle equal to 90 degrees, the line set is "RIGHT ANGLE".

It is a straight line that intersects another line at 90 degrees

a flat line.90 degrees is a straight corner, L180 degrees is a straight line, l270 degrees is a straight corner but opposite of 90 degrees, L360 degrees is a straight line that have turned all the way round, l