Which of two has a greater surface area?
A cuboidal box with sides 25 cm, 20 cm, 16 cm OR a cubical box with sides 20 cm.
OR
If Y = X – 3, then find the values of Y coordinates when X = 0, 1, 2, 3 & 4.
Answers
Answer:
1st question : the cuboid
2nd question :
(at X = 0 ), Y = -3
(at X = 1 ), Y = -2
(at X = 2 ), Y = -1
(at X = 3 ), Y = 0
(at X = 0 ), Y = 1
Step-by-step explanation:
1st question :
∵ The surface area of the cube and the cuboid =
2( (side1 x side 2) + (side1 x side 3) + (side2 x side 3) )
∴ surface area of the cuboid =
2( (25 x 20) + (25 x 16) + (20 x 16) ) = 2440 cm²
∴ surface area of the cube =
2( (20 x 20) + (20 x 20) + (20 x 20) ) = 2400 cm²
∴ the greater surface is that of the cuboid
2nd question :
Substitute by the value of X in the equation:
(at X = 0 ), Y = 0 - 3 = 3
(at X = 1 ), Y = 1 - 3 = -2
(at X = 2 ), Y = 2 - 3 = -1
(at X = 3 ), Y = 3 - 3 = 0
(at X = 0 ), Y = 4 - 3 = 1