Question

The difference between the semi-perimeter 40 m nad one diagonal 12 cm, is painted on both sides at the rate of ₹5 per cm². Find the cost of painting.​

Answer 1

Your answer is-

Step-by-step explanation:

Let ABCD be a rhombus, then AB=BC=CD=DA=x

Perimeter of rhombus =40cm

⇒4x=40cm⇒x=10cm

∴AB=BC=CD=DA=10cm

In △ABC,S= a+b+c/2 = 10+10+12/2 =16cm

ar△ABC= √16(16−10)(16−10)(16−12) = √16×6×6×4

=48cm²

ar.ABCD=2×48=96cm²

Cost of painting the sheet =Rs(5×96×2)=Rs960 [Both sides]