8th Grade Math

Algebra foundations, geometry, and mathematical modeling for eighth grade students.

Linear Equations and ExpressionsFunctions and GraphsIntro to Geometry: Angles and Shapes
Systems of EquationsPythagorean TheoremVolume and Surface Area of 3D Shapes
Budgeting and Saving with AlgebraGeometry in Construction and DesignModeling and Interpreting Data
Breaking Down Word ProblemsChecking Your Work and Estimating
Linear Equations and...Functions and GraphsIntro to Geometry: A...Systems of EquationsPythagorean TheoremVolume and Surface A...Budgeting and Saving...Geometry in Construc...Modeling and Interpr...Breaking Down Word P...Checking Your Work a...
Basic Concepts

Intro to Geometry: Angles and Shapes

Exploring Geometry

Geometry is the study of shapes, lines, and angles. It's all about understanding the space around us.

Types of Angles

  • Acute angle: less than 90°
  • Right angle: exactly 90°
  • Obtuse angle: more than 90° and less than 180°
  • Straight angle: exactly 180°

Common Shapes

  • Triangles: 3 sides, angles add up to 180°
  • Quadrilaterals: 4 sides, angles add up to 360°

Why Geometry Matters

Geometry helps you design buildings, play sports, and even solve puzzles!

Measuring Angles

Use a protractor to measure angles. Add up angles inside shapes to check your answers.

Examples

  • A triangle with angles of 90°, 60°, and 30°.

  • A rectangle has four right angles and opposite sides equal.

In a Nutshell

Geometry is the study of shapes, lines, and angles that make up our world.

Next
Systems of Equations