Is this a right-angled triangle? – SSDD Problems

SSDD Problems: 10 tips to supercharge them in the classroom

Dynamic Geometry and Algebra

Triangles assorted problems –

Geometry > Perimeter and area > Area of a triangle – SSDD Problems

Triangles – SSDD Problems

Reflections and Tangents, Thoughts on Math, Education, and Technology

The area of a triangle – SSDD Problems

Looking Below the Surface

SSDD Problems: 10 tips to supercharge them in the classroom

Right-angled Triangles 2 – SSDD Problems

The 30 and 60 triangles – SSDD Problems