On a square handkerchief of side 50 cm, seven non-intersecting circles designs of each radius 7 cm are made. Find the area of the remaining portion of the handkerchief in cm2.
Area of square Handkerchief = 502 = 2500 cm2
Total area of circles = 7 x π x 72 = 1077.02 cm2
Remaining area = 2500 - 1077.02 = 1422.98 cm2 ~ 1423 cm2