Khan Academy: Recognizing Triangle Types

It's frog party time! With frog banners, frog juice, and a triangle hunt, your garden party is sure to be both entertaining and educational. The lesson connects geometry, earth science, and delicious snacks to teach kids about ecosystems...

Sal gives compares the attributes of different shapes. Includes a video, transcript, and question and answer section. [6:08]

Learn to categorize triangles as scalene, isosceles, equilateral, acute, right, or obtuse.

Discusses the different types of triangles and their angles. [6:00]

Explains how to classify a triangle just by knowing the angle sizes. [5:30]

Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither?

Looks at how to recognize prime and composite numbers and ones that don't fit into either category. [4:39]

You say you can't categorize a triangle because you don't know the length of the sides. Guess what? If you know the size of the angles you can!

Practice identifying triangles by their side-lengths as equilateral, isosceles, or scalene. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Lindsay uses fraction models to identify a fraction greater than 1.