What is an obtuse and acute angle?

An obtuse angle is an angle which is bigger than a right angle (90 degrees) but less than a straight like (which is 180 degrees). An acute angle is an angle which is bigger than 0 degrees and less than a right angle (90 degrees).

Answered by Sam V. Maths tutor

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Add the brackets to make the sum correct for the following equation: 12-11+2-1= 0


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