Resize and rotate different types of quadrilaterals--square, rectangle, rhombus, trapezoid, and kite--while learning the definitions of these different shapes and labeling the angles and diagonals. CCSS.Math.Content.3.G.A.1 Understand...

This video geometry lesson [6:14] explains the concept of perimeter and has varied exercises for students to practice.

Explore fractions in geometric shapes using this interactive worksheet. Concepts include ratio, fractions to decimals, decimals to fractions, and percent. Immediate feedback is given to responses.

Determine which angle has a greater measure by looking at the size of the opening between the angle's rays. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this exercise, students practice identifying equal parts of circles and rectangles. Students receive immediate feedback and have the opportunity to get hints, watch a tutorial video, and try questions repeatedly.

Understand the problem, Devise a plan, Carry out the plan, Look back. The 4 steps by George Polya.

Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.