c) Find the cost of painting all of its faces
at the rate of 10 per cm
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Correct option is B)
s=
2
a+b+c
=
2
6+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)
=24cm
2
Cost of painting =9×24 paise =216 paise = Rs. l
s=
2
a+b+c
=
2
6+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)
=24cm
2
Cost of painting =9×24 paise =216 paise = Rs. l
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