Question

the sides of a triangle shaped sheet are 5 cm, 12 cm and 13 cm. fimd the cost of painting on the sheet at the rate of ​30 per cm²

Answer 1

Step-by-step explanation:

First we may find the area and then calculate the cost of painting the sheet.

Hence its a scalene triangle, we may use the HERONS FORMULA to find the area.

Solution:

semi perimeter= (5+12+13)/2

                         =30/2

                          =15cm

Area of triangle=√s(s-a)(s-b)(s-c)

                         =√15(15-5)(15-12)(15-13)

                         =√15(10)(3)(2)

                          =√3×5×5×2×3×2

                          =3×5×2

                          =30cm²

cost of painting the sheet = Area×per cm cost

                                            =30cm²×30₹

                                            =₹900/cm²

HOPE IT HELPS YOU...