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WAEC Mathematics Past Questions & Answers - Page 243

1,211.

Find the value of X if $cos x = \frac{5}{8}$ for $0^o\le X\le 180^o$

141.3^o

128.7^o

51.3^o

48.7^o

38.7^o

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,212.

In $sin(X+30)^o=cos40^o$ ,find X

10^o

20^o

50^o

60^o

90^o

View answer & explanation

Correct answer is B

$sin(X+30)^o=cos40^o\\ X+30+40=90^o$ complementary angles
$X=20^o$

1,213.

In the diagram, PQ||SR. Find the value of Z

30^o

40^o

45^o

90^o

120^o

View answer & explanation

Correct answer is D

Given PQ//SR
x = 45º

y = 45º

z = ?

Sum of angles in a triangle = 180º

(x + y + z)º = 180º

(45 + 45 + z)º = 180º

90º + zº = 180º

z = (180 - 90)º

z = 90º

1,214.

In ∆PQR. ∠PQR is a right angle. |QR| = 2cm and ∠PRQ = 60^o. Find |PR|

4√3cm

4cm

2√3cm

$\frac{4}{3}cm$

1cm

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,215.

A box contain 2 white and 3 blue identical balls. If two balls are picked at random, one after the other, without replacement, what is the probability of picking two balls of different colours?

$\frac{5}{25}$

$\frac{7}{20}$

$\frac{3}{5}$

$\frac{2}{3}$

$\frac{5}{6}$

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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