Triangles

About Triangles

Triangles can be sorted by their sides or by their angles. Fourth graders learn equilateral, isosceles and scalene triangles, and acute, right and obtuse triangles, then use both ideas to name one triangle two ways.

There are 3 levels of 10 questions each. A wrong answer gets a hint, a second miss shows the answer, and kids earn up to 3 stars. It is free and untimed, with no sign-in or download.

Skills Practiced

• Classifying triangles by side lengths
• Classifying triangles by angle size
• Equilateral, isosceles and scalene triangles
• Acute, right and obtuse triangles
• Naming a triangle using both its sides and angles