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.

Does your child need a little more practice finding the area of a triangle? This worksheet will give them all the practice they need!

Give your students targeted practice finding the area of a triangle in this focused geometry worksheet.

Know a good geometry detective? Challenge your student to use the formula for calculating the area of a triangle.

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?

This eighth-grade geometry worksheet introduces students to the Triangle Angle Sum Theorem and has them practice finding a missing interior angle in a triangle.

Give students practice finding the area of triangles using the area formula with this sixth- and seventh-grade geometry worksheet!

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

Give students extra practice finding the area of triangles using the area formula with this sixth- and seventh-grade geometry worksheet!

Give your fourth grader a gentle introduction to geometry with this charming triangle area worksheet.

Learners sleuth out the area of three triangles in this helpful geometry worksheet.

Learners sleuth out the area of three triangles in this simple geometry worksheet.

How many sides does a triangle have? Three! Sort shapes that have three sides and shapes that don't have three sides with this wacky worksheet.

Students use the Triangle Angle-Sum Theorem to solve for the variable in triangles where two or more angle measures are linear algebraic expressions.

Students practice using the converse of the Pythagorean theorem to identify right triangles with this geometry worksheet!

Practice using the converse of the Pythagorean theorem to identify right triangles with this eighth-grade math worksheet!

Find the missing angle in a triangle using addition and subtraction.

Is it a square? Is it a triangle? This cut and paste worksheet will help your child categorize quadrilaterals, which are four-sided shapes.

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

What's the connection? Make lines between the dots to create triangles with this dotty worksheet.

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 closer look at acute triangles with this sixth- and seventh-grade geometry worksheet!

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