Trigonometry develops the concept of trigonometry from simple comparisons to more formal approaches.
Trigonometry: measuring with triangles
Trigonometry: similar triangles
Trigonometry: using sine
Trigonometry: using cosine
Trigonometry: using tan
Trigonometry: find hypotenuse
Trigonometry: find angles
Area of Triangles helps users to find the area of triangles.
Area of triangles: triangles with a right angle
Area of triangles: height intersects with the base inside the triangle
Area of triangles: height intersects with the base outside the triangle
Area of triangles: triangles without vertical or horizontal sides
Area of triangles
Squirt helps users explore and express proportional relationships.
Squirt: three containers: complex proportional relationships
Learn Alberta: Exploring Fractions and Percentages series.
Exploring combined percentages