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A right angled triangle has one angle that is 90 degrees. The other two must be acute and may (but need not) be equal to one another.

An acute triangle has all its angles less than 90 degrees. They may be all the same, two of them the same or all different.

An isosceles triangle has two angles the same (and hence acute). The third angle can be acute, right or obtuse.

A scalene triangle has three unequal angles. Two of them must be acute but the third may be acute, right or obtuse.

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Q: Difference between right isosceles acute scalene?

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