Lines and triangles

This is . . .

• a scalene triangle

• an acute triangle

• an isosceles triangle

• an obtuse triangle

What are the two ways to classify triangles?

• By the angles and number of sides

• By the angles and side lengths

• By the side lengths and the size of the triangle

• By the angles and the how many points

A triangle can be classified as an isosceles triangle if there are two equal sides.

• True

• False

What are the three ways to classify triangles by their sides?

• equilateral, right, isosceles

• scalene, obtuse, right

• equilateral, isosceles, scalene

• acute, right, isosceles

What does the term scalene mean?

• all sides equal

• two sides equal

• 90 degree angle

• all sides not equal

What type of triangle is this?

• Equilateral

• Isosceles

• Scalene

What type of triangle is this?

• Scalene

• Isosceles

• Equilateral

Which type of triangle is pictured?

• Equilateral

• Isosceles

• Scalene

Classify the triangle by its sides.

• Scalene

• Isosceles

• Equilateral

Look at the triangle pictured. 
What do the lines (sticks) mean on a shape?

• The lines (sticks) show sides that are equal
• The lines (sticks) show sides that are not equal