# NCERT Class 8 Mathematics Solutions: Chapter 11 – Mensuration Exercise 11.2 Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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1. Find the area of a rhombus whose side is and whose altitude is 4 cm. If one of the diagonals is long, find the length of the other diagonal.

Answer:

Since rhombus is also a kind of parallelogram.

Area of rhombus = Base Altitude

Also,

Area of rhombus

So, the length of the other diagonal is .

2. The floor of a building consists of tiles which are rhombus shaped and each of its diagonals are in length. Find the total cost of polishing the floor, if the cost per is .

Answer:

Area of one tile

Area of tiles

Cost of polishing the floor per sq. meter

Cost of polishing the floor per Meter

So, the total cost of polishing the floor is .