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INCORRECT: No because there is a obtuse triangle and a right triangle


Yes all triangles have at least two acute angles. Obtuse triangles and right triangles also have at least two acute angles. They are called obtuse triangles and right triangles because by definition they are triangles with ONE obtuse angle and ONE right angle. So therefore they both have 2 acute angles. Also for an acute triangle, it would have 3 acute angles.

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2012-09-30 22:38:20
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Q: Do all triangles have two acute angles?
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Triangle with all angles less than ninety?

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

How are acute and obtuse triangles the same?

Similarities between these and all triangles are:They all have 3 sides and 3 angles. The sum of the three angles adds up to 180°.An acute angle is less than 90 degrees. An acute triangle has all three sides are acute.An obtuse angle is more than 90 degrees. An obtuse triangle has one angle which is obtuse, and because of the 180° rule above, the other two angles will be acute.So all triangles will have at least two acute angles.

Two right triangles are similar if the acute angles of one triangle are congruent to the acute angles of the other triangle?

yes there similar

Some triangles have two obtuse angles and one acute angle?

Spherical triangles as on the earth's surface.

Does an acute triangle have obtuse angles?

No, an obtuse triangles has one obtuse angle and two acute angles. If a triangle has an obtuse angle, it is considered obtuse and cannot be acute.

Related questions

Which shapes have acute angles?

All triangles have at least two acute angles. Acute triangles have three. Rhomboids also have two acute angles.

What types of triangles have at least two acute angles?

All triangles need at least two acute angles

Do all acute triangles have only one acute angle?

No. All triangles MUST have at least two acute angles.

Do triangles have at least one right angle?

Triangles can be classified by their sides or their angles. When classifying them by their angles, triangles are called: acute triangles - all three angles are acute (less than 90º) right triangles - one right angle (90º) and two acute angles obtuse triangles - one obtuse angle (larger than 90º) and two acute angles

Do all triangles have at least two acute angles?


How many triangles have at least two acute angles?

All of them

Can a triangle have two acute angles?

Yes. In fact, all triangles MUST have at least two acute angles.

Do all right triangles have acute angles?

All right angle triangles have a 90 degree angle and two acute angles that add up to 90 degrees

Are all triangles have 2 acute angles?

Yes, that is the least amount of acute angles a triangle may posses, but a triangle may also have three acute angles. The sum of all triangles' interior angles are equal to 180 degrees; therefore, it is physically impossible to have less than two acute angles, yet entirely possible to contain two or three acute angles.

Do isosceles triangles have exactly two acute angles?

Answer: Yes, because of the two angles have to be exactly equal in order to be isosceles. And no isosceles has 3 acute angles and then it will be equilateral triangle Answer: No, the isosceles triangle can either have two acute angles, or all three can be acute.

What do triangles have?

two acute angles and three lines

What is a triangle with at least 2 acute angles?

All triangles have at least two acute angles so the question does not add any further value.

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