Question

the sides of a triangular board are 6cm 8cm and 10cm . the cost of painting it at the rate of 70 paise per cm² is​

Answer 1

Answer:

The correct answer is Rs.2.16

Step-by-step explanation:

Therefore brief answer and explanation is

s=2a+b+c=26+8+10=12

By Heron's formula,

Area of the triangle = s (s−a) (s−b) (s−c) = 12 (12−6)(12−8) (12−10)

= 12 (6) (4) (2) = 24cm²

Cost of painting = 9×24 paise =216 paise = Rs. 2.16.