MathematicsThe edges of a triangular board are 6cm, 8cm and 10cm. The cost of painting it at the rate of 9 paise per cm2 is

The edges of a triangular board are 6cm, 8cm and 10cm. The cost of painting it at the rate of 9 paise per cm2 is

  1. A
    Rs. 2.00
  2. B
    Rs. 2.16
  3. C
    Rs. 2.48
  4. D
    Rs. 3.00

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    Solution:

    a=6 cm

    b=8 cm

    c=10 cm

    s=a+b+c2=6+8+102=242

    Area =s(sa)×(sb)×(s×c)

    =12×(126)×(128)×(1210)

    =12×6×4×2

    =24 cm2

    Cost of painting it at the rate of 9 paise =24×9=216 paise=216100 rupees

    =Rs.2.16

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