Jawapan

2015-10-24T19:03:33+08:00
Make it into an equation as below:
    -Let x be long and y be wide 
    -equation is as below
    -2x+2y=2πr (let π be 22/7)
    -2(24)+2(20)=44/7r
    -88=44/7r
    -88x7=44r
    -616=44r
    -616/44=r
    -r=154
2015-10-24T19:10:18+08:00
2(24) + 2(20)
= 48 + 40
= 88 cm

2 pi r = 88
2 x 22/7 x r = 88
r = 88 /2 x 7/22
r = 14 cm