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3 years ago

Help me ans should be well explained

Mathematics

2 answers:

seraphim [82]3 years ago

6 0

<h3>Length (L) of Rectangle = 40 m </h3><h3>Breadth (B) of Rectangle = 30m</h3><h3 /><h3>Perimeter of Rectangle:-</h3>

= 2(Length + Breadth)

= 2(40 + 30)

= 2(70)

= 140m

<h3>Area of Rectangle:-</h3>

= Length × Breadth

= 40 × 30

= 1200m^2

Therefore, The perimeter of the rectangle is 140m and the area of the rectangle is 1200m^2.

rusak2 [61]3 years ago

4 0

Length=L=40m
Breadth=B=30m

Perimeter:-

$\\ \sf\longmapsto 2(L+B)$

$\\ \sf\longmapsto 2(40+30)$

$\\ \sf\longmapsto 2(70)$

$\\ \sf\longmapsto 140m$

Area

$\\ \sf\longmapsto LB$

$\\ \sf\longmapsto 40(30)$

$\\ \sf\longmapsto 1200m^2$

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4 years ago

An angle is drawn in standard position passing through the unit circle at (0.643,0.766). The angle in standard position θ has a

Flura [38]

<h2>Hello!</h2>

The asnwer is: Cos50° ≈ 0.643

A unit circle is a cirgle with a radius equal of 1, knowing that, also know the following:

The angle is drawn passing trough the unit circle at (0.643,0.766) it means that:

$x=0.643\\y=0.766$

So,

Cos50° ≈ 0.643

We can prove that by following the next steps:

- If it's a unit circle,here is a right triangle with hypotenuse of 1,

$1^{2}=x^{2}+y^{2}$

$1^{2}=0.643^{2}+0.766^{2}$

$1^{2}=0.4134 +0.5867$

$1=1.0001=1$

- We can determine the cosine of the angle by the following formula:

$cos(\alpha)=\frac{x}{hypotenuse} \\cos(\alpha)^{-1}=cos(\frac{0.643}{1})^{-1} \\\alpha=49.98$

Therefore,

Cos(α)=49.98°≈50°

Also, if there is a right triangle, according to the Pythagorean Thorem:

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Hence,

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Have a nice day!

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3 years ago

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malfutka [58]

There would be 5184 ways in which each subject books can be selected.

Explanation:

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Number of chemistry books = 4

Number of Science books = 7

Different ways of selecting geography books = 5!

= 5 X 4 X 3 X 2 X 1

= 120

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= 4 X 3 X 2 X 1

= 24

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= 7 X 6 X 5 X 4 X 3 X 2 X 1

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Total different possible ways they can select them = 120 + 24 + 5040

= 5184

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3 years ago

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nata0808 [166]

Answer:

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Step-by-step explanation:

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3 years ago

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Help me ans should be well explained ​

Help me ans should be well explained