A. 0.525cm
B. 4.2cm
C. 80%
D. 60%
Explanation:
The area of two similar triangles is the ratio of the square of the corresponding heights.
Therefore , 12/48 = (2.1)2 /h2
=> h2 = 4 x (2.1)2
=> h=(2 x 2.1)=4.2 cm
Related Mcqs:
- The difference between the radi of the smaller circle and the bigger circle is 7cm and the difference between the area of two circles is 1078Sq.cm Radius of the smaller circle is_________?
A. 17.5cm
B. 21cm
C. 28cm
D. None of these - The average height of 35 boys in a class was calculated as 180cm. It has later found that the height of one of the boys in the class was wrongly written as 166 cm whereas his actual height was 106 cm. Find the actual average height of the boys in the class (Round off your answer to two decimal places)?
A. 179.29 cm
B. 178.29 cm
C. 179.38 cm
D. 178.39 cm - The average height of 50 pupils in a class is 150 cm. Five of them whose height is 146 cm, leave the class and five others whose average height is 156 cm, join. The new average height of the pupils of the class (in cm) is __________ .
A. 149
B. 151
C. 152
D. 153 - A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
A. 2 : 1
B. 3 : 2
C. 25 : 18
D. 27 : 20 - A swimming bath is 24 m long and 15 m broad. When a number of men drive into the bath. The height of water rises by 1cm. If the average volume of water displaced by each man be 0.1m3 how many mean are there in the both?
A. 32
B. 36
C. 42
D. 46 - The area of a circle is increased by 22Sq.cm when it’s radius is increased by 1cm. The original radius of the circle is_________?
A. 6cm
B. 3.2 cm
C. 3 cm
D. 3.5 cm - A big rectangular plot of area 4320 Sq.m is divided into 3 square shaped smaller plots by fencing parallel to the smaller side of the plot. However, some area of land was still left as a square plot could not be formed. So 3 more square shaped plots were formed by fencing parallel to the longer side of the original plot. Such that no area of the plot was left a surplus. What are the dimensions of the original plot?
A. 160m × 27m
B. 240m × 18m
C. 120m × 36m
D. 135m × 32m - There are two circles of different radii. The area of a square is 196 sq.cm, whose side is half the radius of the larger circle. The radius of the smaller circle is three-seventh that of the larger circle. What is the circumference of the smaller circle ?
A. 12 π cm
B. 16 π cm
C. 24 π cm
D. 32 π cm - How many shots of 1cm radius can be prepared from a sphere of 3cm radius?
A. 36
B. 64
C. 27
D. 16 - The circumferences of two circles are 264 meters and 352 meters. Find the difference between the areas of the larger and the smaller circles.
A. 4192 sq m
B. 4304 sq m
C. 4312 sq m
D. 4360 sq m
