336
420
576
720
Correct answer is A
Total floor area = 720 x 420
Area of one tile = 30 x 30
No. of tile required = \(\frac{720 \times 420}{30 \times 30}\)
= 24 x 14
= 336 tiles
4sin2 x - 3 = 0, find x if 0 \(\geq\) x \(\geq\) 90o
30o
45o
60o
9o
Correct answer is C
4 sin2x - 3 = 0
sin2x = \(\frac{3}{4}\)
Sin x = \(\pm\) \(\sqrt{\frac{3}{4}}\)
= \(\pm\) \(\sqrt{\frac{3}{4}}\)
= 60o
10(sin 35o - sin 55o)
10 cos35o - cos 55o
10(tan35o - tan55o)
10(cot35o - cot55o)
Correct answer is D
x = 10 cot35o - 10 cot55o
= 10(cot35o - cot55o)
If x : y = 5 : 12 and z = 52cm, find the perimeter of the triangle.
68cm
84cm
100cm
120cm
Correct answer is D
13 = 52
1 = \(\frac{52}{13}\)
= 4
5 + 12 + 13 = 30
Total perimeter = 30 x 4
= 120cm
In XYZ, y = z = 30° and XZ = 3cm. Find YZ
\(\frac{\sqrt{3}}{2}\) cm
3\(\frac{\sqrt{3}}{2}\) cm
3\(\sqrt{3}\) cm
2\(\sqrt{3}\) cm
Correct answer is C
Y \(\to\) 30°
X \(\to\) 120°
Z \(\to\) 30°
\(\frac{3}{\text{sin 30}}\) = \(\frac{YZ}{\text{sin 120}}\)
YZ = \(\frac{3\times \sin 120}{\sin 30}\)
\(3 \times \frac{\sqrt{3}}{2} \times 2 = 3\sqrt{3}\)