[Phiwokuhle Nomfanelo Yeni]

<em style=”box-sizing: border-box; font-family: Roboto, sans-serif; outline: 0px; color: rgb(51, 51, 51); font-size: 15px;”>The child’s<em style=”box-sizing: border-box; font-family: Roboto, sans-serif; color: rgb(51, 51, 51); font-size: 15px;”> main challenge is to acquire explicit knowledge of the defining properties of shapes. Children need to understand that a triangle has certain defining properties and a square has others and that these forms are invariant over changes in size, orientation, and color