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4 years ago

If one side of a square notebook measures 20 cm, what is the area of the front cover of the notebook?

Mathematics

2 answers:

fgiga [73]4 years ago

6 0

Area is defined as a product of sides when we talk about squares.

$A=a\cdot a=20\cdot20=\boxed{400}$

The area of the front cover of notebook is 400 centimetres squared.

Hope this helps.

r3t40

natita [175]4 years ago

6 0

Answer:

400 cm

Step-by-step explanation:

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The total length of pencils A, B and C is 29 cm. Pencil a is 11 cm shorter then pencil B, and pencil B is twice as long a pencil

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The length of pencil A is 5 cm

Solution:

Let the length of pencil A be "x"

Let the length of pencil B be "y"

Let the length of pencil C be "z"

The total length of pencils A, B and C is 29 cm

Therefore,

length of pencil A + length of pencil B + length of pencil C = 29

x + y + z = 29 ------------ eqn 1

Pencil A is 11 cm shorter then pencil B

x = y - 11 ------- eqn 2

Pencil B is twice as long a pencil C

y = 2z

$z = \frac{y}{2}$ ------ eqn 3

Substitute eqn 2 and eqn 3 in eqn 1

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Substitute y = 16 in eqn 2

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