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If the angle is larger than a right angle it is obtuse
Because in second angle both quaderent comes negative that's why we cant use second angle method
When the angle you are measuring is obviously an obtuse angle (angle above 90 degrees, or when you draw a box in the angle and it turns out bigger than it's supposed to) you use the big numbers. When the angle is obviously acute (opposite definition of obtuse), you use the little numbers.
An acute angle is smaller than a right angle.An obtuse angle is larger than a right angle.^_^
When lines met or cross at a right angle are perpendicular lines.