Question

8. A floral design on a floor is made up of 16 tiles
which are triangular, the sides of the triangle
being 9 cm, 28 cm and 35 cm (see Fig. 12.18).
Find the cost of polishing the tiles at the rate
cm?
of 50p per cm²​

Answer 1

Step-by-step explanation:

Sapne toh saare tut gaye hai..

Hum toh sabse piche chhut gaye hai...

Na jaane bhagwan konsi saza de rha h hume...

Ke... Na jaane bhagwan konsi saza de rha hai hume..

Ki mere aapne he mujhse ruth gaye hai.....

Answer 2

Step-by-step explanation:

Let,a=9cm,b=28cm and c=35cm

Semi-perimeter (S)=9+28+35/2

=72/2

=36

Area of triangle=

$\sqrt{s(s - a)(s - b)(s - c) }$

$\sqrt{36(36 - 9)(36 - 28)(36 - 35)}$

$\sqrt{36 \times 27 \times 8 \times 1}$

$\sqrt{2 \times 2 \times 3 \times 3 \times 3 \times 3 \times 3 \times}$

$\sqrt{2 \times 2 \times 2}$

$2 \times 2 \times 3 \times 3 \times \sqrt{3 \times 2}$

$45 \sqrt{6}$Cost of polishing the tiles at the rate of 1 cm=

$45 \sqrt{6}$

Cost of polishing the tiles at the rate of 50 per cm=

$50 \times45 \sqrt{6}$

$2250 \sqrt{6}$