Want to see more? E-mail us at illuminations@nctm.org and tell us what would be useful in your classroom.
Area of Rectangles
This applet allows for the exploration of the area of rectangles.
Area of Triangles
How do you find the area of a triangle?
Bunny Times
Become confident in facts up to 12 x 12 using visual models that stress the conceptual aspects of multiplication.
Handshakes
In general, how many handshakes occur when there are n people?
Isosceles Triangle Area
Explore when an isosceles triangle obtains its maximum area.
Proof Without Words: Pythagorean Theorem
Why is c^{2}=a^{2}+b^{2}?
Pythagorean Review
Review and explore the Pythagorean Theorem.
Scale Factor
Investigate how changes in the scale factor influence the ratio of perimeters and the ratio of areas between two figures.
Angle Bisector
This interactive demonstrates how to bisect an angle.
Circumcircle
This applet allows for the construction and exploration of a circumcircle.
Diagonals to Quadrilaterals
Investigate three types of quadrilaterals; ones with: perpendicular bisectors, congruent perpendicular bisectors, and congruent bisectors.
Euler's Line
Discover and explore Euler's Line.
Incenter-Incircle
This applet allows for the discovery of the incenter and incircle of a triangle.
Power of a Point
What, if any, relationships can you identify among the segments (for each chord) and radius?
Proof Without Words: Completing the Square
Why is ?
Simson Line
This applet allows for the construction and exploration of the Simson Line.
Soccer Problem
Where should a soccer player be placed so that she has the best chance of making a goal?
If you would like to rate this lesson, then please register. Riuscipisci bla feummod olenim dignit irit luptatum zzriliquamet la commodigna facilit prat.