Q: Triangles with all angles less than 90 degrees?

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All their angles are less than 90 degrees.

Triangles, by definition, have 180 degrees. Angles that are less than 90 degrees are said to be acute.

An acute triangle has all three angles less than 90 degrees.

No, but all equilateral triangles are acute. Acute: All angles of the triangle are less than 90 degrees. Equilateral: All angles of the triangle are 60 degrees.

Acute triangles have all of their angles less than 90 degrees. Right triangles have one of their angles equal to 90 degrees. Obtuse triangles have one of their angles greater than 90 degrees. Also, the 45-45-90 triangle and 30-60-90 triangle are useful when trying to get exact answers in trigonometry.

Related questions

All their angles are less than 90 degrees.

Triangles, by definition, have 180 degrees. Angles that are less than 90 degrees are said to be acute.

An acute triangle has all three angles less than 90 degrees.

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

Acute triangles have angles less than 90 degrees. Right triangles have 90 degree angles.

No, but all equilateral triangles are acute. Acute: All angles of the triangle are less than 90 degrees. Equilateral: All angles of the triangle are 60 degrees.

Acute triangles have all of their angles less than 90 degrees. Right triangles have one of their angles equal to 90 degrees. Obtuse triangles have one of their angles greater than 90 degrees. Also, the 45-45-90 triangle and 30-60-90 triangle are useful when trying to get exact answers in trigonometry.

Equilateral triangles have angles that all equal 60 degrees. Acute triangles all have an angles that are less than 90 degrees.

All equilateral triangles are acute triangles, since all the angles are less than 90 degrees.

never In non-Euclidean geometry triangles can have angles that are more or less than 180 degrees.

Yes. All equilateral triangles are acute triangles, as they have 3 angles of 60 degrees each, all less than 90 degrees.

an acute triangle is a triangle that has corner angles all below 90 degrees. there are three types of triangles: obtuse, right, and acute. obtuse triangles have one corner angle greater than 90 degrees, right triangles have one angle equal to 90 degrees, and acute triangles have all corner angles less than 90 degrees.