NCERT Class 8 Mathematics Solutions: Chapter 11 –Mensuration Exercise 11.1 Part 3

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1. A flooring tile has the shape of a parallelogram whose base is and the corresponding height is . How many such tiles are required to cover a floor of area ? [If required you can split the tiles in whatever way you want to fill up the corners]

Answer:

Given,

Base of flooring title

Corresponding height of a flooring tile

Now,

Area of flooring tile

Number of tiles required to cover the floor

Hence tiles are required to cover the floor.

2. An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round? Remember, circumference of a circle can be obtained by using the expression , where is the radius of the circle.

Given Different Shapes Scattered on the Floor

Answer:

(a) Radius

Circumference of semi-circle

(b) Diameter of semi-circle

Radius

Circumference of semi-circle

Total distance covered by the ant

(d) Diameter of semi-circle

Radius

Circumference of semi-circle

Total distance covered by the ant

Hence for figure (b) food piece, the ant would take a longer round.