Right menu

Featured resource


Media > TDT > Reasoning > R_A_D_AS1_S1_fig1

R_A_D_AS1_S1_fig1

« 
Previous image
|
|
Next image
 »

Each of the triangular numbers 6 and 10 is modelled with rows of squares. Then one shape is rotated 180 degrees so that the two triangular numbers fit together, creating a 4 by 4 square.

Proof by modelling.

Related content

R_A_D_AS4_S...

R_A_D_AS3_S...

R_A_D_AS3_S...

R_A_D_AS2_S...

R_A_D_AS2_S...