Question

please SOLVE THIS............​

Answer 1

Answer:

Rs.  $705.60$

Step-by-step explanation:

There are total 16 tiles in shape of triangle.

Area of tiles = 16 * area of 1 triangle

By heron's formula

Area of triangle = $\sqrt{s(s-a)(s-b)(s-c)}$

Here, s is the semi-perimeter,

and a, b, c are the sides of the triangle

Here, a = 9cm , b = 28cm , c = 35cm

$s = \frac{a+b+c}{2}$  $= \frac{9+28+35}{2}$  $= \frac{72}{2}$  $= 36 cm$

Area of triangle = $\sqrt{s(s-a)(s-b)(s-c)}$

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

                          = $\sqrt{36(27)(8)(1)}$

                          = $\sqrt{36(9*3)(4*2)}$

                          = $\sqrt{6^{2}*3^{2}*2^{2}*3*2 }$

                          = $\sqrt{6^{2} } *\sqrt{3^{2} } *\sqrt{2^{2} } *\sqrt{3*2}$

                          = $6*3*2\sqrt{6}$

                          = $36\sqrt{6} cm^{2}$

                          = $36 * 2.45 cm^{2}$

                          = $88.2cm^{2}$

Area of tiles = 16 * area of 1 triangle ΔABC

                    = $(16 * 88.2)cm^{2}$

                    = $1411.2cm^{2}$

Cost of polishing per centimetre square are is 50p

Cost of polishing $1411.2cm^{2}$ area = Rs. $(1411.2*\frac{1}{2})$

                                                      = Rs.  $705.60$

Therefore, it will cost Rs.  $705.60$ while polishing all the tiles.

Hope it helps you buddy!!!

Answer 2

Step-by-step explanation:

$\sf{Rs.  705.}$

Hope.....It Helps....