Your toddler likely enjoys playing with the geometric shapes that fit in his puzzle ball. He's probably just beginning to repeat the names of the shapes as you hand them to him. The angles of triangle adapt well to a toddler's hands, allowing him to hold the triangle more securely than some other shapes. Develop his interest in triangles by providing activities based on the shape.
Creating sturdy triangle shapes for your toddler allows him to use them for various activities. Cut triangles from card stock, craft foam or sections of a cardboard box. Cover them with colorful wrapping paper -- and then laminate them. Give your tot a large circle with a handful of medium-sized triangles, encouraging her to make a jack-o-lantern face. Mix some water-based paints in small pie tins -- and hand your tot a sponge cut into a triangle to stamp colorful triangles on a sheet of butcher paper. If you use fabric paint, she can make a triangle shirt or an arts-and-crafts apron.
Toddlers enjoy crafts -- and you can use triangles as the foundation for many craft projects. Glue the ends of three craft sticks together to make triangle frames that your tot can decorate with markers or crayons. Cut family pictures into triangle shapes to fit behind the triangle frames. You can also use three triangle frames to make a "spider web." Position them so that one angle of each triangle meets in the center -- and the other two angles point outward to form the sides of a hexagon. Glue and clamp the center points together for your kiddo. Help your toddler use pipe cleaners to link the triangles and form the three missing hexagon edges. Wrap additional pipe cleaners around the centers of the interior triangle sides to form the spider web. Your kiddo can then glue a small cotton ball "spider" on the web frame.
Some craft stores carry metal triangles and other rhythm instruments that your toddler can play when she sings. Alternatively, take a wire coat hanger and securely tie large jingle bells to the hanger -- and wrap the hook securely with yarn or foam to prevent injury to your child. Your kiddo can then shake the triangle or bang it with a kitchen spoon. To make a cardboard version of the triangle, fold a wrapping paper tube in thirds and slip a long scarf or rope into the tube, tying the ends together to form a triangle before tying on the bells. Monitor your toddler to ensure that she doesn't put the bells in her mouth.
Your home may contain triangles for your tot to find. Go through the house with your toddler trying to spot items with triangular shapes. If you can’t find enough triangles, hide some in his room, on the bookshelf and other easy places for him to find. You can also make cardboard triangle cards in various colors for your tot to match and sort. On inclement weather days, hang triangles on the walls using mounting putty -- and have your tot jog from triangle to triangle, based on the color you name.