Question
The base of a right pyramid is a square of side 10
The base of a right pyramid is a square of side 10
cm. If its height is 10
cm. then the area (in cm2) of its lateral surface is:
Slant height = EF Height = EO = 10 cm OF = 10/2 = 5 cm In ΔEOF, EF^2 = OE^2 + OF^2 ⇒ 10^2 + 5^2 ⇒ EF = √125 = 5√5 Slant height = EF = 5√5 cm Perimeter of the base = 4 × 10 = 40 cm Lateral surface = (1/2) × Perimeter of the base × Slant height ⇒ (1/2) × 40 × 5√5 ⇒ 100√5 cm^2More Average Questions
- In a school club, the ratio of juniors to seniors is 3:2. The average score of all seniors is (x − 2) and the average score of all members is (x + 4). What...
- A college group of 50 students has an average age of 23 years. 10 new students are added and the average age decreases to 21. What is the average age of th...
- There are 30 employees in a company, out of which 50% are officers and the rest are workers. The average salary of each employee in the company is Rs. 22,0...
- The average weight of 20 students in a class is 52 kg. Two students leave the class, and their combined average weight is 40 kg. Subsequently, six new stud...
- A bag contains 20 rupees note, 50 rupees note and 100 rupees note in the ratio 5:7:2. If the total amount in the bag is Rs 2,600, find the average number o...
- For three distinct numbers a, b and c, if a = 250, (a + b) = 550 and (c – b) = 50, find the average of the three.
- The average of a set of 's' numbers is 45. If 180 is added to the set, then the average of the set becomes 45.2. Find the value of '4 X (s - 18)'.
- The average salary of 9 employees in an office is ₹40,000. When the manager leaves, the average salary becomes ₹36,000. Find the salary of the manager.
- Average marks scored by each boy in a class were 80, whereas that by each girl were 88. If the number of boys is 50% more than the number of girls, then fi...
- A set contains ten numbers. The average of the first six numbers is (x - 4), and the average of the last three numbers is (x + 2). The average of the entir...
Hey! Ask a query
Please enter email id
The email must be a valid email address.
Please enter Mobile Number
Please enter valid Mobile Number
Please enter your Doubt
