Free account: track your progress — Sign up free

JAMB Mathematics 2016 Objective — Question 31

Question 31 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2016 Objective paper, with the correct answer and a full explanation.

31. Length of an arc l is (θ/360)×2πr. If l = 16π and θ = 80° find the radius r. A. 36cm B. 60cm C. 24cm D. 30cm

A. 36cmCorrect
B. 60cm
C. 24cm
D. 30cm

Explanation

l = (θ/360)×2πr → 16π = (80/360)×2πr → r = 16π×360/(80×2π) = 36cm.

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Mathematics 2016 Objective More Mathematics past papers