A problem of finding the circumference on the paper in the third grade of primary school? How? I got it.

Wu of Light: Hello.

Find the circumference of the I-shape? It lacks the height of the waist gap.

(1) Suppose the shape of this I-shape is a square.

Circumference = 35cm× 4+12cm× 4 =140cm+48cm =188cm.

(2) Assume that the gap at the waist is a square of 12cm.

Circumference = [35cm+(11× 2+12) cm ]× 2+12cm× 4 =138cm+48cm =186cm.

(3) Unless the height of the waist gap is indicated.

Good luck, goodbye.