Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
6th grade (Eureka Math/EngageNY)
Module 5: Area, surface area, and volume problems
Topic A: Area of triangles, quadrilaterals, and polygons
Area of a triangle on a grid
Area of a triangle on a grid
Learn how to calculate the area of a triangle on a grid.
License: CC BY-NC-SA by Khan Academy