Isosceles Triangles May Be Obtuse or Acute but Never Right.

A right triangle may be isosceles or scalene. If a triangle has two acute angles in the third angle is ____.

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In a right triangle one of the angles is a right anglean angle of 90 degrees.

. Classify the triangle on the left. Assuming the picture is to scale the triangle on the right is definitely obtuse see the blue angle as well as scalene. Since this triangle has two congruent angles and two congruent sides it is an Isosceles Triangle.

An equiangular triangle is a kind of acute triangle and is always equilateral. A right triangle is _____ an obtuse triangle. Check Hint Show answer.

An isosceles triangle _____ has two sides congruent. Since a triangle is obtuse or right if and only if one of its angles is obtuse or right respectively an isosceles triangle is obtuse right or acute if and only if its apex angle is respectively obtuse right or acute. A triangle with one obtuse angle must have two acute anglestrue or false.

Classify the triangle on the left. In an acute triangle all angles are less than right angleseach one is less than 90 degrees. If 2 angles of one triangle are congruent to two angles of a second triangle then the third angles of both triangles are also congruent.

An isosceles triangle is _____ an acute triangle. An obtuse triangle is _____ a scalene triangle. An isosceles triangle may be right or acute but never obtuse.

Check Hint Show answer.

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