WAEC Mathematics Past Questions & Answers - Page 327

1,631.
1,632.

The angle of a sector of a circle of diameter 8cm is 135°. Find the area of the sector [Take \(\pi\) = 22/7].

A.

\(9\frac{3}{7}cm^2\)

B.

\(12\frac{4}{7}cm^2\)

C.

\(18\frac{6}{7}cm^2\)

D.

\(25\frac{1}{7}cm^2\)

Correct answer is C

Area of a sector

\(\frac{θ}{360°} * πr^2\)

= \(\frac{135}{360} * 3.142 * 4 * 4\)

= \(18\frac{6}{7}cm^2\)

 

1,634.

Find the volume of a cone of radius 3.5cm and vertical height 12cm [Take π = 22/7]

A.

3.4cm2

B.

15.5cm2

C.

21.0cm2

D.

42.0cm2

E.

154.0cm2

Correct answer is E

No explanation has been provided for this answer.

1,635.

With reference to the graph above, which f the following solution sets is represented by ΔOPQ?

A.

y ≥ x, y ≤ 0, y + x ≥ 7

B.

y ≤ x, y ≥ 0, y + x ≤ 7

C.

y ≥ x, y ≥ 0, y + x ≤ 7

D.

y ≤ x, y ≤ 0, y + x ≤ 7

E.

y ≤ x, y ≥ 0, y + x ≥ 7

Correct answer is D

No explanation has been provided for this answer.