半径= 12.56 ÷ 3.14 ÷ 2cm
扇形面积 = 2²π × (144 ÷ 360)
= 4 × 3.14 × 0.4
= 12.56 × 0.4
= 5.024平方厘米
答：圆心角为是144°的扇形的面积是5.024平方厘米.