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In plane geometry, all triangles have the sum of the angles to be 180 degrees. So There are many triangles with all the angles less than 90. ( if one angle is more than 90 degrees, then its called 'obtuse' , if all the angles are less than 90, then its called 'Acute' ).
Two types of triangles with angles less than 90 degrees are Equalaterial and Isocoles. ( Equalaterial have two equal angles, Isocoles have three equal angles, all 60 degress ).
You can think in terms of sets:
The subset of Triangles is Acute,
The subset of Acute Triangles is Equalateral,
The subset of Equalateral Triangles is Isocoles.
{Triangles{Obtuse|Acute{Equlaterial{Isocoles
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A triangle with all angles measuring less than 90 degrees?
A triangle with all angles measuring less than 90 degrees?That's an 'acute' triangle.
What type of triangle has three angles that each measure less than 90 degrees?
An acute triangle is one in which all interior angles are less than 90 degrees.
What is a triangle with all angles measuring less than 90 degrees?
An acute triangle
What has 1 less vertex than a hexagon and 2 more angles than a triangle?
1 vertex less than a hexagon is a pentagon. 2 angles more than a triangle is a pentagon.
Which type of triangle has three angles with measures less than 90°?
A triangle which measures less than 90%
