Circle Circumference and Area Tutorial
Learn the formulas for circle circumference and area using pi, work through examples with radius and diameter, then drill with instant-feedback practice questions.
Sub-topic — Math
Geometry tutorials and practice pages
Each geometry topic starts with a tutorial that explains the formula and works through examples step by step. A practice page then generates fresh questions so you can drill until the method feels automatic.
Included topics
Geometry learning paths
Pythagorean Theorem Tutorial
Learn how to use the Pythagorean theorem, identify right triangles, and solve for missing sides before moving into practice questions.
Rectangle Area and Perimeter Tutorial
Learn the formulas for rectangle area and perimeter, work through examples that cover every question type, then drill with instant-feedback practice questions.
Square Area and Perimeter Tutorial
Learn the formulas for square area and perimeter, work through examples for every question type including finding a side from the area, then drill with instant-feedback practice questions.
Triangle Area Tutorial
Learn two methods for finding the area of a triangle — the base-times-height formula and Heron's formula — then drill with instant-feedback practice questions.
Rectangular Prism Volume and Surface Area Tutorial
Learn the formulas for rectangular prism volume and surface area, work through labeled examples with 3D diagrams, then drill with instant-feedback practice questions.
Trapezoid Area Tutorial
Learn how to find the area of a trapezoid using the average-of-bases formula, work through examples with labeled SVG diagrams, then drill with instant-feedback practice questions.