Question

The length,breath and the height of a rectangularsolidare in ratio of 5:4:2.If surface area is 1216 centimetre square find the length breadth and height of the solid.​

Answer 1

Step-by-step explanation:

Surface area= 2( 5x*4x + 4x*2x + 2x*5x) = 2( 20x²+8x²+10x²)= 2*38x²= 76x²

1216= 76x²

x²= 1216/76 = 16

x = square root of 16 = 4cm

length= 5*4= 20cm

breadth= 4*4= 16cm

height= 2*4= 8cm

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Answer 2

Answer:

Let the angle be 5 x 4 xnd 2 x

Tsa =2(Ib+bh+hI)=1216

2(20x squad 2+8 x squad 2 +10 x squad 2) =1216

76 x squad 2=1216/76

X squad 2=1216/76

X squad 2=16

X = 4 cm

Dimensions are 20 cm, 16m and 8cm.

Volume=lbh

=>20*16*8

=2560cm

I am sure this will help you...