Noyce Foundation
Lyle's Triangles
Try five problems on triangles. Levels A and B focus on shapes that can be created from right triangles. Level C touches upon the relationship between the area of a six-pointed star and the area of each triangle of which it is composed....
Curated OER
Exploring Polygons and The Greedy Triangle
Excellent lesson plan! Anne Linehane's geometry story, The Greedy Triangle, offers an opportunity to practice forming various types of polygons with your learners. Using elastic bands (or Chinese jump ropes),...
Curated OER
Counting Triangles
Help your little learners recognize number words one through ten. Each slide contains a triangle with a number word inside of it. As the slides progress, more triangles appear in successive order 1-10. This is a great way to reinforce...
Curated OER
Exploring Triangles
Students research the different types of triangles, including right, isosceles, scalene, and equilateral triangles. They identify the characteristics of various types of triangles and then draw them using appropriate vocabulary to...
Curated OER
Learning Triangles
In this triangles worksheet, students recognize triangles. Students complete the worksheet by practicing drawing triangles and recognizing triangles in a picture.
Illustrative Mathematics
All vs. Only Some
All shapes have certain defining attributes that set them apart from others. In order to understand this, young mathematicians look at examples and non-examples of triangles, rectangles, and squares, working as a whole class to create...
Curated OER
Forming New Shapes from Old Shapes
Shapes can be joined together to make new shapes! Young geometers experience this phenomenon as they examine four shape challenges in this worksheet. Scholars create a rectangle from two right triangles and a fish from an oval and a...
Curated OER
Shape Sort
Sorting is a great way to familiarize learners with basic shapes in this partner activity. Pairs have sixteen shape cards with various sizes and types of triangles, rectangles, hexagons, and squares. They have four category cards in...
Curated OER
2-Dimensional Shapes: Naming Shapes
Get to know eight shapes by name: square, rectangle, triangle, pentagon, hexagon, and octagon. Young geometers write the correct name below each of these shapes, using a word bank for guidance. Then, they draw two of the shapes (hexagon...
Curated OER
Naming 2-Dimensional Shapes
Inside each of these two-dimensional shapes, scholars identify the figure by writing its name. There is a word bank for them to work from, but some shape names are used multiple times. There are six identifiers they use: pentagon,...
Curated OER
Circles, Squares, Triangles and Rectangles In Our World
Here is an engaging geometry lesson plan which has students identify the properties of shapes and cut shapes out of magazines. They make cookies using cookie cutters in various shapes.
Curated OER
Tracing Triangles
In this tracing triangles worksheet, students recognize, trace, and draw different forms and sizes of triangular figures. Students complete two triangle activities.
Arizona State University
Tricorn Triangles
Help your learners examine triangles. Pupils explore the different sizes and measurements of triangles. They discover triangles can be isosceles or scalene, and examine the attributes of triangles. Here is the website where you can find...
Curated OER
Evergreen Tree
Learners use a ruler to make measurements, and to create triangles and a rectangle. They take the shapes they've made and assemble them into an evergreen tree image. This simple, yet effective, lesson would be ideal for young learners...
Curated OER
Geometry
What a fun activity for younger learners! Using this resource, they can discuss the attributes of squares, rectangles, triangles, circles, and ovals, and also engage in a motivating activity. For those learning about simple shapes, this...
Curated OER
2-Dimensional Shapes: Coloring Shapes
For beginners to color, number, and shape theory, this is a great way to solidify skills. They use a key at the top to determine which color (yellow, green, purple, or blue) to shade each shape (square, triangle, circle, and rectangle,...
Curated OER
Same Shape and Size
Can your kindergartners recognize shapes? What about when they are in different orientations? Youngsters study groups of shapes to determine which have the same shape and size. Two of the groups have triangles and ovals, and the other...
Curated OER
Shapes: Triangles
In this learning shapes worksheet, students practice their fine motor skills as they trace the triangle shape and trace the word "triangle."
Curated OER
Triangles and Rectangles
In this geometric shapes worksheet, students study five pictures of trees made out of triangles and rectangles. Students follow the directions to trace and color the shapes they find in the picture.
Curated OER
Triangles and Ovals- Ice Cream Cones
In this geometric shapes worksheet, students look for ovals and triangles in a picture of three multi-scoop ice cream cones. Students follow the directions to color each shape they find.
Curated OER
Triangles
In this triangles worksheet, students can cut out or count the triangles given to them. Students cut or count 13 different colored triangles.
DK Publishing
Draw the Shape ~ Counting Triangles
Starting simply, scholars begin by tracing two triangles before drawing one or two on their own. Next, they examine three pictures to determine how many triangles they see in each. Learners record their answers, practicing writing...
Curated OER
Types of Triangles
Students classify triangles by the length of their sides. In this geometry lesson, students use a white board to demonstrate the angles of various triangles. Students construct an equilateral, isosceles, and a scalene triangle.
Curated OER
Isosceles Triangles
Students investigate triangles. In this shapes geometry lesson, students define and state the attributes for equilateral, scalene, and isosceles triangles. Students locate the prefix "tri" in a variety of words and make connections with...
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