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Calculate and correct to three significant figures, the length of an arc subtends an angle...

Mathematics
WAEC 1989
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
  • E. 50.3cm
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Correct Answer: Option B
Explanation
Circumference of circle = 2πr = 2 x 3.14 x 4
= 25.1cm 360o = 25.1cm
70o =
25.1/360
x 70 = 4.89
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts