Circle - Jamb Mathematics Past Questions and Answers

Question 26:

• JAMB 1980

In the figure, PS = SR and Rx is a tangent to the circle at R, < QRX is equal to 72^o. Find

A. 20^o
B. 36^o
C. 72^o
D. 30^o
E. 15^o

Question 27:

• JAMB 1981

An isosceles triangle of sides 13cm, 13cm, 10cm is inscribed in a circle. What is the radius of the circle?

A. 7cm
B. 12cm
C. 8cm
D. 7cm
E. 69cm

Question 28:

• JAMB 1981

The area of a circular plate is one-sixteenth the surface area of a ball of a ball, If the area of the plate is given as P cm², then the radius of the ball is

A. \(\frac{2P}{\pi}\)
B. \(\frac{P}{\sqrt{\pi}}\)
C. \(\frac{P}{\sqrt{2\pi}}\)
D. 2\(\frac{P}{\pi}\)

Question 29:

• JAMB 1981

What is the length of an arc of a circle that substends 2\(\frac{1}{2}\) radians at the centre when the raduis of the circle = \(\frac{k}{k + 1}\) + \(\frac{k + 1}{k}\) then

A. P < 0
B. P\(\geq\) 0
C. P \(\leq\) 0
D. P < 1
E. P > 0

Question 30:

• JAMB 1982

In the fiqure where PQRTU is a circle, ISTI = IRSI and angle TSR = 52^o. Find the angle marked m

A. 128^o
B. 52^o
C. 104^o
D. 64^o
E. 116^o