Thank you for watching our Geometry | Lines and Angles Compilation.

This math music video about Types of Lines that is as entertaining as it is informative. Your students will be singing & dancing, all the while learning or reinforcing the knowledge of parallel, perpendicular, and intersecting lines.

When you hear the word "geometry", you might think of shapes. And you wouldn't be wrong! But before we can get to shapes, we need to talk about the parts that can make up shapes, like points, lines, rays, and line segments. In this...

In this video, the teacher explains angle facts using the concepts of alternate interior angles and supplementary angles in the context of parallel lines and a transversal. The teacher reviews four algebraic expressions representing...

SchoolOnline's Secondary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 13-17, they cover every key topic and sub topic covered in GCSE Maths in clear and easy to follow...

In this math video we will learn about congruent angles formed by parallel lines & a transversal. We will review the definitions of vertical angles, alternate interior angles and alternate exterior angles. We will also apply these...

What is angle A in the star-shaped figure? This problem appeared on the 1999 AMC 8 test (intended for 8th grade students in the US). Approximately 75% of test-takers did not mark the correct response. Can you figure it out? Watch the...

This problem was given to Primary 6 (age 11-12) students in Singapore. What is the area of the shaded region in the video, which consists of the region bounded by 4 quarter circles in a 3x3 grid of squares, and each square has a side...

Thanks to Hyeong-jun (H. J.) for emailing me this problem! This is a challenging problem from the math section of the 1997 CSAT, a standardized test in South Korea. Can you figure it out? It took me several attempts, but it was really...

Step right on up to the Ticketing booth and discover the conformity! The uniformity! As you find each ride’s lines of symmetry in SYMMETRY LAND!” Find similar parts facing each other or around an axis on the various rides at our musical...

In this video, the teacher provides practice questions for Grade 8 students to prepare for end-of-year assessments or finals. The questions are based on Common Core standards and cover various topics such as geometry, linear equations,...

In this video, the teacher explains how to identify the correct statements about a transformation of a triangle on a coordinate plane. The teacher goes through each answer choice and explains why it is either correct or incorrect,...

In this shorts video we will identify the equation of a perpendicular line. We are given a linear equation written in slope-intercept form. We are also given four answer choices in slope-intercept form. Each of the answer choices has...

Do your fourth-grade math students need to learn how to measure an angle using a protractor? This educational kids math video shows upper elementary math students how to use a protractor! This educational geometry video is a great...

Ready to dive into the world of Parallelograms? Buckle up for a fun ride through shapes and angles! 🚀



In this video, we'll be checking out Parallelograms – those funky four-sided figures with sides that are parallel....

In this math video we will identify and use facts about vertical, complementary & supplementary angles to solve problems. We will review the definition of an angle. We will draw an angle from two rays and a vertex. We will draw...

You could say that angles are some of the building blocks of geometry, and you've probably already seen lots of examples of angles in your life already. In this lesson, we'll go over the exact definition of an angle, how to name an...

Which figures can you form from the two shapes A and B? This is a sample question from the 2017 NAEP for 8th grade US students. Be sure to select all of the correct choices! It's tricky, only 7 percent found all of the correct answers....

A marshmallow has the shape of a cylinder with diameter 5 and height 3. A dessert is made with 24 marshmallows: there are two stacked layers of marshmallows, and each layer has 3 rows of 4 marshmallows. The gaps between the marshmallows...

Media outlets around the world are reporting on these math problems that have "flummoxed" everyone. As these got so much attention, I wanted to share some of the headlines and give a small discussion about what I think is the real lesson...

Thanks to George who sent me this problem (created by 7th grade math teacher Ms. V)! There is a table in the video. The numbers in the first column are increased by the same percentage to give the numbers in the second column. But the...

This challenging problem was given to 8th graders in Russia, but it stumped me! The question was presented as text only--no diagram. Also, the problem was part of an entrance exam for a selective high school. Can you solve it? From each...

"Jess wants 200 ribbons of length 110 centimeters for a party. However, the ribbons were sold at 25 meters per tape. How many tapes will Jess need?" Yahoo News reports many adults find this problem is too tricky. Can you figure it out?...

"If Sue runs around the track twice, and John runs around the track four times more than Sue, how many times does John run around the track?" This problem was given to 3rd graders. A parent disagreed with the answer the teacher was...