Mathematics Vision Project
Circles: A Geometric Perspective
Circles are the foundation of many geometric concepts and extensions - a point that is thoroughly driven home in this extensive unit. Fundamental properties of circles are investigated (including sector area, angle measure, and...
Alabama Learning Exchange
Alex: Geometrica Fights Back!
This activity is designed to give young scholars practice with the properties of special quadrilaterals (parallelograms, rectangles, rhombuses, squares, trapezoids, and kites). The students are provided with a "murder mystery" sheet with...
National Council of Teachers of Mathematics
Nctm: Illuminations: A Geometric Investigation of (A + B)2
This interactive demonstrates why (a + b)2 = a2 +2ab + b2.