Check out this cube: The figure presents a cube. The length of one edge is labeled as 4 units The figure presents a cube. The le
1 answer:
Answer:
The surface area of the cube is 96 squared unit.
Explanation:
The surface area of a cube is the addition of the area of each surfaces. The surface net of the cube illustrates that it has 6 squares of 4 unit length each.
So that,
Area of a square = length × width
But, length = width
⇒ Area of a square =
=
= 16
Area of one of the squares of the cube is 16 squared unit.
Surface area of the cube = number of squares × Area of one of the squares of the cube
= 6 ×16
= 96 squared unit
The surface area of the cube is 96 squared unit.
You might be interested in
Answer:
The boy: 8 years old
The sister: 11 years old
Explanation:
We assume that the age at present of the boy is x (years old).
As he is younger than his sister 3 years, so that his sister's present age is great than x 3 years
=> Her present age is: x + 3 (years old)
Two years ago, the boy is younger than present two years
=> The boy's age two years ago is: x - 2 (years old)
Similarly, the sister's age two years ago is: (x+3)-2 = x + 1 (years old)
As given, two years ago he was two-thirds of his sister's age, so that we have:
<em>The boy's age two years ago = </em><em> × the sister's age two years ago</em>
⇒
⇒
⇒
⇒
⇒
=> x + 3 = 8 + 3 = 11
So the present age of the boy is 8 years old, of the sister is 11 years old