Jamb Mathematics 2005 Past Questions and Answers

Question 21:

• JAMB 2005

Three straight lines EF, GH and LK interest at O as shown above. If ∠ KOF = 52^o and ∠ LOH = 85^o, calculate the size of ∠ EOG.

A. 26^o
B. 43^o
C. 52^o
D. 85^o

Question 22:

• JAMB 2005

The sum of the interior angle of a regular polygon is 1800^o. Calculate the size of one exterior angle of the polygon

A. 30^o
B. 24^o
C. 18^o
D. 12^o

Question 23:

• JAMB 2005

In the diagram above, O is the center of the circle,
∠ UOT = 70^o and ∠ RST = 100^o. Calculate ∠ RUO.

A. 20^o
B. 25^o
C. 50^o
D. 80^o

Question 24:

• JAMB 2005

A sector of a circle has an area of 55 cm². If the radius of the circle is 10 cm, calculate the angle of the sector
[π = 22/7]

A. 45^o
B. 63^o
C. 75^o
D. 90^o

Question 25:

• JAMB 2005

Find the curved surface area of a cone with circular base diameter 10 cm and height 12 cm

A. 25 πcm²
B. 65 πcm²
C. 120 πcm²
D. 156 πcm²