A man standing in one corner of a square football field observes that the angle subtend by a pole in the corner just diagonally opposite to this corner is 60°. When he retires 80 m from the corner, along the same straight line, he finds the angle to be 30°. The length of the field is
20 m
40√2 m
40 m
20√2 m
If the median drawn on the base of a triangle is half its base, then the triangle will be
obtuse angled
equilateral
right angled
acute angled
The average age of 14 girls and their teacher's age is 15 yr. If the teacher's age is excluded, then the average reduces by 1. What is the teacher's age?
29 yr
35 yr
32 yr
30 yr
The value of a machine depreciates every year at the rate of 10% on its value at the beginning of that year. If the current value of the machine is ₹ 729, then its worth 3 yr ago was
₹ 947.10
₹ 800
₹ 1000
₹ 750.87
Find the maximum number of trees which can be planted 20 m apart on the two sides of a straight road 1760 m long.
174
176
180
178
Two circles of same radius 5 cm, intersect each other at A and B. If AB = 8 cm, then the distance between the centres is
10 cm
4 cm
6 cm
8 cm
The curved surface area and the total surface area of a cylinder are in the ratio 1 : 2. If the total surface area of the right cylinder is 616 cm2, then its volume is
1632 cm3
1078 cm3
1232 cm3
1848 cm3
B.
1078 cm3
Curved surface area of cylinder:
Total surface area of cylinder:
Now, according to the question,
Now, Total surface area = 616 cm2
∴ Volume