Question

calculate the area and perimeter of the remaining portion, after cutting four quadrants each of radius 7cm, from the four corners of a rectangle measuring 20cm by 30cm

Answer 1

area of rectangle =20cm*30cm=600cm sq.
area of four quadrants =22/7cm*7cm*4=88cm square
area of remaining portion = 600cm sq.-88 cm sq.=512cm sq.
l
perimeter of portion= 8cm *4=32cm

Answer 2

Answer:

area of rectangle =20×30=600cm²

area of four quadrants make one circle so,

area of circle =πr²

=22/7×7×7=154cm²

area of remaining portion =600-154=446

now we have to find perimeter of remaining portion

=2(l+b)-2πr

=2(20+30)-2×22/7×7

=2(50)-44

=100-44

=66 cm

so here are the answers I guess they are helpful

glad to help