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
- A cricketer's average over 25 innings is 50. In the following 5 innings, he scores 100, 90, 85, 75, and 70 runs. What will be his new average?
- The average profit of a shop for the first 3 months is Rs.500 per month. If the shop owner wants the average profit to be Rs.800 per month over 6 months, w...
- The total number of students in class A and B is 72. The number of students in A is 40% more than that in B. The average marks of students in B are 50% mor...
- The incomes of ‘X’, ‘Y’, and ‘Z’ are in the ratio 5:6:9, respectively. The average income of the three is Rs. 15,000. If ‘X’, ‘Y’, and ‘Z’ spend 40%, 80%, ...
- The average age of A and B is 19 years. If A is to be replaced by C, the average would be 18 years. The average age of C and A is 20 years. Find the age of...
- The average score of a student increased by 5 marks when he scored 210 marks in his 60th test. Find the average score of the student after 60 tests.
- The average weight of 40 students in a class is 50 kg. If two new students with weights 72 kg and 68 kg join the class, find the new average weight of the ...
- The average marks of Karan in 5 different papers was calculated as 73. But it was later found that his marks in two subjects were wrongly entered as 80 and...
- The average age of Anuj, Saroj and Tanuj is 36 years. The average age of Anuj and Saroj is 30 years, while the average age of Tanuj and Anuj is 36 years. F...
- The average of 5 numbers is 46. If one number, 38, is removed, what is the average of the remaining 4 numbers?
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
Think You're Ready for RBI Grade B?
RBI Grade B 2026 Phase 1 Memory Based Paper
- 200 Questions with Detailed Solutions
- Section-wise Coverage (GA, English, Quant & Reasoning)