WAEC - Mathematics (1989 - No. 40)
Calculate and correct to three significant figures, the length of an arc subtends an angle of 70o at the center of the circle radius 4cm. [Take π = 22/7]
2.44cm
4.89cm
9.78cm
25.1cm
50.3cm
설명
Circumference of circle = 2πr = 2 x 3.14 x 4
= 25.1cm 360o = 25.1cm
= 25.1cm 360o = 25.1cm
70o =
25.1360
x 70 = 4.89