Learn geometry—angles, shapes, transformations, proofs, and more.

Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a geometer.

Is really saying: "In triangle ABC, the angle BAC is a right angle" For angles the central letter is where the angle is. Example: ∠ABC is 45°. The point "B" is where the angle is. Symbols save time and …

Jul 23, 2025 · Geometry is a branch of mathematics that explores the properties, relationships, and measurements of shapes, sizes, positions, and dimensions of objects in space. It delves into the …

Jan 27, 2026 · If you’re looking at your geometry homework and are totally stumped by all of the symbols and markings you see, you’re in the right place. We’ve put together an easy list of all the …

This video shows you how to draw the lewis dot structure of BCl2-. It also discusses the bond angle, hybridization, and the molecular geometry of the BCl2- ion as well.

This Basic geometry and measurement course is a refresher of length, area, perimeter, volume, angle measure, and transformations of 2D and 3D figures. If you are learning the content for the first time, …