National Security Agency
Classifying Triangles
Building on young mathematicians' prior knowledge of three-sided shapes, this lesson series explores the defining characteristics of different types of triangles. Starting with a shared reading of the children's book The Greedy...
CPALMS
2D Rotations of Triangles
Where does the line of rotation need to be to get a cone? Pupils respond to three questions involving rotating a right triangle about different lines. The scholars describe the solid created along with providing details about its...
Curated OER
All About Triangles
In this triangles activity, students recognize triangles in a picture. Students find all the triangles in the picture, trace them and color them black.
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."
Noyce Foundation
Parallelogram
Parallelograms are pairs of triangles all the way around. Pupils measure to determine the area and perimeter of a parallelogram. They then find the area of the tirangles formed by drawing a diagonal of the parallelogram and compare their...
Inside Mathematics
Hopewell Geometry
The Hopewell people of the central Ohio Valley used right triangles in the construction of earthworks. Pupils use the Pythagorean Theorem to determine missing dimensions of right triangles used by the Hopewell people. The assessment task...
Inside Mathematics
Rhombuses
Just what does it take to show two rhombuses are similar? The assessment task asks pupils to develop an argument to show that given quadrilaterals are rhombuses. Class members also use their knowledge of similar triangles to show two...
Curated OER
Triangles and Circles
In this colors and shapes activity, students recognize the circles and triangles and the colors yellow and orange. Students trace the circles and color them yellow and trace the triangles and color them orange.
Inside Mathematics
Rugs
The class braids irrational numbers, Pythagoras, and perimeter together. The mini-assessment requires scholars to use irrational numbers and the Pythagorean Theorem to find perimeters of rugs. The rugs are rectangular, triangular,...
University of Utah
Explore Proportional and Linear Relationships
Progress from proportional relationships to linear functions. Pupils first review concepts of proportionality covered in earlier grades. They then extend these concepts to linear functions, such as determining the slope of a...
Curated OER
Triangles and Rectangles
In this geometric shapes worksheet, learners 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
Mt. Whitney to Death Valley
This is an intriguing problem that brings together real-world data, technology, and mathematical problem solving. If visibility wasn't an issue, could you see from the highest point in the lower 48 states, Mt. Whitney, to the lowest...
Curated OER
Calculating the Area of a Triangle
A quick definition and the formula for finding the area of a triangle is provided at the top of this worksheet. After reading the description, 5th graders must find the area of the 3 given triangles. This is an excellent enrichment...
Curated OER
Shapes and Colors: Triangles and Ovals
In this shape and color worksheet, students trace triangles coloring them brown, then trace ovals and color them pink. Students also trace and pictures of a ice cream cones made of triangles and ovals.
Curated OER
Squares and Triangles in a Picture
In this geometric shapes worksheet, students analyze a picture of a house and trace all the squares and triangles. Students color the shapes according to the directions.
Inside Mathematics
Patterns in Prague
Designers in Prague are not diagonally challenged. The mini-assessment provides a complex pattern made from blocks. Individuals use the pattern to find the area and perimeter of the design. To find the perimeter, they use the Pythagorean...
Curated OER
Shapes and Colors: Triangles and Rectangles
In this shape and color worksheet, students trace all triangles in a set of 4 different shapes and color each one green, then trace all rectangles, coloring them brown. Students trace and color 5 triangle "trees."
Curated OER
Circles and Triangles: Sun
For this coloring shape worksheet, students trace the circles and color them yellow. Kids trace the triangles and color them orange. Students then trace the circle and triangle at the bottom of the page.
Curated OER
Find the Shapes in a Picture
Use coloring to remind young learners that geometry is all around them! A simple image of a house, sun, and tree becomes the format for several basic shapes. The instructions direct scholars to trace and color each shape using a...
Curated OER
Shapes and Colors
In this shapes and colors worksheet, students analyze a picture of a house that is made with squares, rectangles and triangles. Students follow the directions to trace and color each of the geometric shapes they find in the picture.
Curated OER
Shapes and Color: Rectangles and Triangles
In this shape and color worksheet, students trace rectangles, coloring them pink, then trace circles, coloring them purple. Students then trace and color a set of 6 circles.
Curated OER
Pythagorean Theorem
For this Pythagorean theorem worksheet, 9th graders solve and complete 8 different types of problems. First, they go to the given website and copy the picture shown. Then, students draw a right triangle using the straight line between...
Curated OER
Shapes
In this learning shapes instructional activity, students practice their fine motor skills as they trace the square, triangle, rectangle, and circle shapes.