Classifying Triangles by Sides and Angles

What is an acute triangle?

• A triangle where all three angles are less than 90 degrees.

• A triangle with one angle greater than 90 degrees.

• A triangle with two equal sides.

• A triangle where all angles are equal to 90 degrees.

Tags

TEKS.MATH.4.6C

What are the three types of triangles based on angles?

• Acute, Right, and Obtuse

• Scalene, Isosceles, and Equilateral

• Obtuse, Right, and Equilateral

• Acute, Scalene, and Right

Tags

TEKS.MATH.4.6C

What is a right triangle?

• A triangle that has one angle measuring exactly 90 degrees.

• A triangle with all sides of equal length.

• A triangle that has no angles measuring more than 60 degrees.

• A triangle that has two angles measuring 45 degrees.

Tags

TEKS.MATH.4.6C

What does it mean if a triangle has a right angle?

• It means that one of its angles is exactly 90 degrees.

• It means that all angles are equal.

• It means that the triangle is equilateral.

• It means that the triangle has two obtuse angles.

Tags

TEKS.MATH.4.6C

What is a scalene triangle?

• A triangle with all sides of equal lengths.

• A triangle with at least two sides of equal lengths.

• A triangle with all sides of different lengths and all angles of different measures.

• A triangle with one angle measuring 90 degrees.

Tags

TEKS.MATH.4.6C

True or False: A right triangle can have two right angles.

• True

• False

• It depends on the triangle's orientation

• Only in non-Euclidean geometry

Tags

TEKS.MATH.1.6D

True or False: A right, isosceles triangle has 1 right angle and 2 equal sides.

• True

• False

• It has 2 right angles and 1 equal side.

• It has 1 right angle and 3 equal sides.

Tags

TEKS.MATH.4.6C

What is an isosceles triangle?

• A triangle with all sides equal.

• A triangle with at least two sides equal and the angles opposite those sides are equal.

• A triangle with no equal sides.

• A triangle where all angles are acute.

Tags

TEKS.MATH.4.6C

What do the lines (sticks) on a triangle indicate?

• The lines (sticks) show sides that are equal.

• The lines (sticks) indicate the angles of the triangle.

• The lines (sticks) represent the height of the triangle.

• The lines (sticks) show the perimeter of the triangle.

What is an equilateral triangle?

• A triangle with all three sides equal and all angles measuring 60 degrees.

• A triangle with one angle measuring 90 degrees.

• A triangle with all sides of different lengths.

• A triangle with two sides equal and one angle measuring 45 degrees.

Tags

TEKS.MATH.4.6C