Discussion
The 3D solid given below has edges of equal length of 16 cm. A rectangular hole of dimensions 4x3 cm and depth 2 cm is made in the centre of each face. Calculate the total surface area of the resulting solid in square cm.
2 years ago
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vinit shimpi
2736
a year ago
Amogh Wadhonkar
2777
This is an icosahedron which has 20 faces.
To calculate the surface area just calculate the surface area for one face then multiply it by 20.
Surface area of one face is (area of triangle+area of the sides of the rectangular hole)
which is=> 110.84cmsq (triangle)+ 28cmsq (area of sides of the hole)= 138.84cmsq
Multiplying it by 20= 2776.8
Approximately 2777
a year ago
Madhura Regundwar
This is an icosahedron which has 20 faces.
To calculate the surface area just calculate the surface area for one face then multiply it by 20.
Surface area of one face is (area of triangle+area of the sides of the rectangular hole)
which is=> 110.84cmsq (triangle)+ 28cmsq (area of sides of the hole)= 138.84cmsq
Multiplying it by 20= 2776.8
Approximately 2777
a year ago
SAPTARSHI DEBNATH
2245.02
Answer
a year ago