Question

Devi has a grid in the shape of a parallelogram. She has equilateral triangles with an area of 40 square millimeters that fit on the grid.
If the base of the grid is 26 centimeters and the height is 10 centimeters, how many triangles can Devi fit on the grid?

Answer 1

The area of the parallelogram is 26 × 10 = 260 cm^2 ;
The area of equilateral triangle is 0.4 cm^2 ;
The number of triangles can Devi fit on the gris is 260 ÷ 0.4 = 260 × ( 10 / 4 ) = 2600 / 4 = 650 ;