Calculate and correct to three significant figu... - WAEC Mathematics 1989 Question
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]
A
2.44cm
B
4.89cm
C
9.78cm
D
25.1cm
correct option: b
Circumference of circle = 2πr = 2 x 3.14 x 4
= 25.1cm 360o = 25.1cm
= 25.1cm 360o = 25.1cm
70o =
25.1/360 x 70 = 4.89
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