Radford University
Parallel Lines, Transversals, and Angles: What’s the Connection?
Streets, bridges, and intersections, oh my! Parallel lines and transversals are a present in the world around us. Learners begin by discovering the relationship of the angles formed by parallel lines and a transversal. They then...
Illustrative Mathematics
Are These Right?
Is that a right triangle or a wrong triangle? Young mathematicians look at eleven different shapes and use a measuring tool of their choice to determine which triangles have right angles. Consider cutting out sets of the shapes to...
Mathematics Assessment Project
Applying Angle Theorems
Polygon ... an empty bird cage? After finding the angles of a polygon, young mathematicians use the provided methods to solve the problem in multiple ways.
Willow Tree
Angle Sum Property of Triangles
All triangles have some things in common. Using these properties of triangles, learners find missing angle measures. Scholars use the Angle Sum Property and properties of special triangles throughout the lesson.
Illustrative Mathematics
Sum and Difference Angle Formulas
Need practice deriving trigonometric angle formulas? With this worksheet, pupils derive the sum and difference formulas for cosine and tangent and the difference formula for sine. Scholars use the sine sum formula and other known...
Mathed Up!
Angles
What does a geometric farmer drive? A protractor, of course! A set of assessment worksheets prompts learners to use a protractor as they measure angles, name angles, and identify lines. Use the video as a way to...
Project Maths
Introduction to Angles
Approach the lesson from the right angle. A discussion-based lesson leads helps learners understand angles in terms of rotation. Individuals use manipulatives to explore the properties of angles and learn how to name them. The lesson is...
EngageNY
Unknown Angle Proofs—Proofs of Known Facts
Lead the class in a Greek history lesson plan with a geometric twist. Pupils relate a short video about geometric properties to modern-day methods of solving for unknown angles. They discuss parallel line theorems and...
Concord Consortium
Triangles: Angle Space
Three angles in a triangle, three-dimensional space, it all seems connected somehow. Given several different triangles, pupils use the three angles of the triangle as coordinates to plot points in three-dimensional space. They explore...
Messenger Education
My Angle on Cooling—Effect of Distance and Inclination
When exploring Mars, spacecrafts are exposed to 5-11 times more sunlight than when near Earth. Groups of pupils complete a hands-on activity to explore how distance and angle of the sun affect temperature. Through discussions, they then...
Curated OER
Explore Right Angles
Students investigate right angles. For this geometry lesson, students define the word "angle" and create a right angle finder from an index card. Students find right angles in their classroom. As an extension activity, students try to...
EngageNY
Base Angles of Isosceles Triangles
Build confidence in proofs by proving a known property. Pupils explore two approaches to proving base angles of isosceles triangles are congruent: transformations and SAS. They then apply their understanding of the proof to more complex...
Noyce Foundation
What's Your Angle?
Math can be a work of art! Reach your artistic pupils as they explore angle measures. A creative set of five problems of varying levels has young learners study interior and exterior angle measures of polygons. The introductory levels...
Curated OER
Angles and Arcs formed by Intersecting Chords
In this angles and arcs worksheet, learners complete a warm-up, state the formula formed by intersecting chords, and answer eight problems. The worksheet includes a closing think pair share problem.
Curated OER
Geometric Angles
Students explore angles and their use in Geometry. Students investigate three different kinds of angles: obtuse, acute, and right angles through an online activity. They identify pairs of angles with special relationships: vertical,...
Curated OER
Types of Angles
In this online math activity, students perform calculations which allow them to identify 3 types of angles. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A...
Curated OER
Relationship between Exterior and Remote Interior Angles in a Triangle
In this triangle worksheet set, 9th graders find the relationship between the exterior and remote interior angles in triangles. They determine the formula, and apply it in 15 problems. They use a compass as needed to measure angles.
Curated OER
Measuring Angles
Identifying and measuring angles with a protractor can provide a fun way for students to learn this mathematical concept.
Curated OER
Angle Pairs: Vertical Angles
In this geometry activity, 10th graders define vertical angles as it relates to interesting lines. There are 24 problems about solving vertical angles.
Curated OER
Lift and Launch Angle
Learners engage in a hands-on experiment to determine how launch angles affect airflow around the wing of an aircraft. They view a series of photographs and read information describing the Wright Brothers' experiences. They complete a...
Curated OER
Angles
In this math worksheet, students practice defining angles and work on some various problems that focus upon the fraction of a turn.
Curated OER
Corresponding Angles
In this corresponding angles worksheet, learners identify corresponding angles and determine their angle measurement. This two-page worksheet contains 6 problems. Answers are provided on the last page.
Curated OER
Angle Sum of Triangles and Quadrilaterals
In this angle sum learning exercise, students find missing angles of 20 triangles and quadrilaterals. Students find the missing angle in each polygon by using the total degrees of each and given angle measures.
Curated OER
Angles at a Point
In this angles worksheet, students find the measurement of missing angles. They identify complimentary, supplementary and vertical angles. This one-page worksheet contains 4 problems. Answers are provided.
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