youcubed: Youcubed My Heart
youcubed (Stanford University)

My heart is always with youcubed. Here’s a tessellation of our logo!

youcubed: Paper Folding
youcubed (Stanford University)

The activity encourages students and teachers to engage in visual, creative thinking. We have coupled Mark’s activity with asking students to reason and be convincing, two important mathematical practices.

youcubed: Messing with Pascal (3-5)
youcubed (Stanford University)

This activity allows students to explore number patterns within Pascal’s Triangle.

youcubed: Pascal’s Triangle (6-8)
youcubed (Stanford University)

In this activity we invite students to be mathematicians and to find and study patterns in the world’s most famous triangle that has fascinated people for centuries.

youcubed: Triangle Designs (K-2)
youcubed (Stanford University)

Mathematics is a creative and visual subject!

NRICH: Board Blocklive
NRICH (University of Cambridge)

Take it in turns to make a triangle on the pegboard. Can you block your opponent?

NRICH: Third Side
NRICH (University of Cambridge)

What are the possible lengths for the third side of this right-angled triangle?

NRICH: Terminology
NRICH (University of Cambridge)

Given an equilateral triangle inside an isosceles triangle, can you find a relationship between the angles?

NRICH: Linear Area
NRICH (University of Cambridge)

Find the area of the triangle enclosed by these lines.

NRICH: Graph Triangles
NRICH (University of Cambridge)

Use the information about the triangles on this graph to find the coordinates of the point where they touch.

Illuminations: Sliding Triangle
National Council of Teachers of Mathematics

What is the maximum area achieved during this process?

Illuminations: Same Hypoteneuse
National Council of Teachers of Mathematics

What is the smallest integer that can be the hypotenuse of two different right triangles, each of which has legs whose lengths are also integers?