Grade
PK
Math in Our World: Hidden Triangles
![If you cut a square piece of cheese in half, you get two triangles, one for you and one for a friend. Lil Mouse says, 'Mmmmmm! I love cheese!'](/sites/default/files/styles/large/public/inline-images/s0HcD8oJHGKTJlE3lZEALQ7Ii8bICw5punRnTNwDmRcXoKdAbM.png?itok=q8uRRywX)
What do you notice? What do you see in this picture? Share your ideas with a friend or family member.
Here’s a math puzzle for you: Triangles are all around us! Some triangles can be hiding in other shapes like rectangles, squares, hexagons, and trapezoids. Can you draw lines with your finger or a pencil on the shapes below to show where you see the hidden triangles? How can you find triangles?
![A square, a hexagon, a rectangle, and a trapezoid.](/sites/default/files/styles/large/public/inline-images/bDoxg0EMRjRtxkqc9Da86E1Y169TfhbuVzTvYLGBn5N8jT0e7a.png?itok=fY13mtk8)
- See if you can cut any of the shapes in half. Does that show a triangle?
- If you start at one corner and draw a line to another corner, does it make a triangle?
- Show someone how you’ve made triangles. Then ask them to show you how they can make triangles.
- Are there other shapes that have hidden triangles? Can you find some in your home?
Printable Version
Google doc for printing and copying
Reference for Educators
Sample problems and solutions