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.

Have a blast coloring in this mandala made up of triangles and the number 3. This is a great way to remember that a triangle has three sides.

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

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.

This worksheet will introduce your child to the three types of triangles: the equilateral triangle, the isosceles triangle and the scalene 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.

Help your child learn how to identify an isosceles triangle with this geometry worksheet.

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

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

On this prekindergarten math worksheet, kids draw a line along the path that shows triangles to get to the barn.

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.

A farmer needs to get to his piglets! On this prekindergarten math worksheet, kids draw a line along the path of triangles and rectangles to get to the piglets.

This fun geometry worksheet provides essential practice in finding the area of a triangle.

Your child will need to use their triangle knowledge to find the area of the sails on this sailboat.

On this worksheet, your child willl need to use their triangle knowledge to find the areas of the sails on the sailboat.

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