it means the angle is less than 90 degrees
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An Acute Triangle
A triangle with an acute angle.An acute triangle has all three angles less than 90 degrees.
It is possible for an isosceles triangle to be an acute triangle because, in an acute triangle all the angles have to be less than 90o.
A triangle with 3 acute angles is simply called an acute triangle.An example is an equilateral triangle, which has three angles of 60° (acute).
An equilateral triangle has 3 equal interior acute angles of 60 degrees