Mathematics 1991 Waec Past Questions and Answers

Question 26 :

• WAEC 1991

the graph above is a sketch of

A. Y = sin 2x
B. Y=sinx
C. Y=cos2x
D. Y=2sinx
E. Y = 2cos x

Question 27 :

• WAEC 1991

Given that sin \(\theta\) = -0.9063, where O \(\leq\) \(\theta\) \(\leq\) 270°, find \(\theta\).

A. 65^o
B. 115^o
C. 145^o
D. 245^o
E. 265^o

Question 28 :

• WAEC 1991

From the top of a cliff, the angle of depression of

a boat on the sea is 60^o, if the top of the cliff is

25m above the sea level, calculate the horizontal

distance from the bottom of the cliff to the boat.

A. 50√3m
B. 25√3m
C. 25√3m/3
D. 25m/3
E. √3m/25

Question 29 :

• WAEC 1991

The angle of elevation of the top of a tree 39m

away from a point on the ground is 30^o. Find the height of the tree

A. 39√3m
B. 13√3m
C. 13/\(\sqrt{3}\)m
D. 13/3\(\sqrt{3}\)m
E. \(\sqrt{3}\)/13m

Question 30 :

• WAEC 1991

In the diagram above, ATR is a tangent at the point T to the circle center O, if ∠TOB = 145°, find ∠TAO

A. 20^o
B. 35^o
C. 45^o
D. 55^o
E. 65^o