Jawapan

2015-10-24T09:40:46+08:00
Lilitan bulatan
= 2 pai j
= 2 X 22/7 X 61
= 383.428

ukur lilit sektor bulatan
= 383.428 - 2(88)
= 383.428 - 176
= 207.428

sudut /360 X 2 pai j = ukur lilit sektor bulatan
sudut /360 X 2 X 22/7 X 88 = 207.428
sudut /360 X 553.142 = 207.428
sudut = 207.428 X 360 / 553.142
sudut = 134.999
sudut = 135 darjah