Children find the unknown angles for five triangles, then identify whether the triangle is right, acute, or obtuse, in this geometry worksheet.

Use this glossary with the EL Support Lesson Plan: Triangle Time.

Use these vocabulary cards with the EL Support Lesson Plan: Triangle Time.

Do you believe in the Bermuda Triangle? Compare witness accounts of these weird waters and draw your own conclusions in this reading worksheet.

Can your kindergartener recognize triangles? Give her some extra practice with this worksheet. She'll draw triangles and pick them from a box of other shapes.

Build student understanding of the defining attributes of triangles with this sorting activity. Students will cut out different shape cards and sort them into examples and non-examples of triangles.

Let your fourth grader play triangle detective: can she spot the acute triangles on this worksheet?

These "Treehouse Triangle" worksheets break down the geometric process into easy, solvable steps.

This colorful worksheet asks your fourth grade geometry detective to practice identifying right triangles.

This printable worksheet includes six different shapes: Rectangle, circle, hexagon, rectangular prism, sphere, and triangle. Can they match the shape to its name?

Circle, cheese, triangle, square: One of these things does not belong in this group. Help your child figure out the outlying object with this worksheet.

Is your fourth grader reluctant to practice geometry? This colorful worksheet, which explores obtuse triangles, may be just what he needs!

Take a trip to Shape Town to learn about triangles in this worksheet!

All of these pictures are hiding some sneaky triangles. Can your kindergartener find them all in this colorful worksheet?

Find the facts within the number triangles in this engaging subtraction worksheet!

Find all the triangles in this fun shapes coloring worksheet!

Here's a colorful math challenge for your kindergartener: can he count up all the triangles in the birthday party scene?

Sail through geometry practice with this third-grade worksheet all about finding the perimeter of triangles!

Build subtraction sentences with fact family triangles in this engaging worksheet!

Can your first graders tell the difference between a square and a cube? How about a triangle and a cone? Use this geometry assessment to gauge your students’ abilities to use attributes to sort 2-D and 3-D shapes.

Teach your students to sort triangles as acute, right, or obtuse based on their internal angle type.

This "Treehouse Triangles" worksheets breaks down the geometric process into simple steps. Take angles from archenemy to acquaintance with this worksheet.

Practice geometry in a fun way with this "Treehouse Triangles" worksheet. Get your child to measure angles with ease in this treehouse-themed worksheet.

How many triangles do you see? Introduce your young student to shapes and beginning geometry concepts with this fun coloring sheet.

This worksheet challenges your preschooler to decide which two triangles are the same shape and size.

Use these vocabulary cards with the EL Support Lesson Plan: Fact Family Triangles.

Children will take note of the everyday shapes that surround them in this fun geometry activity.

Students will love getting to make and cut out their own fact family triangles as they practice writing three related numbers.

Focus on fact fluency within 10 in this colorful addition worksheet!

Buster the Builder needs help finding the angles of the walls in this treehouse. Your child will use his geometry know-how to help him out.