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Degger [83]
3 years ago
11

11. The length of a rectangle is three times its width. The perimeter of the

Mathematics
1 answer:
Elenna [48]3 years ago
8 0

Answer: The length of the rectangle is 37.5 inches and the width is 12.5 inches

Step-by-step explanation: The dimensions of the rectangle is not given but we have clues given. The length is given as three times it’s width which means if the width is W, then the length would be given as 3W (three times the width). Also the perimeter is given as 100 inches and the formula for the perimeter is;

Perimeter = 2(L + W)

We can now insert the known values as follows;

100 = 2(3W + W)

100 = 2(4W)

100 = 8W

Divide both sides of the equation by 8

12.5 = W

Having calculated the width as 12.5 inches, the length now becomes

L = 3W

L = 3 x 12.5

L = 37.5

Hence the length is 37.5 inches and the width is 12.5 inches

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The Math Club is selling shirts to raise money for a Pi Day Convention. Short sleeve shirts are $5 and long sleeved shirts are $
Sladkaya [172]
<h2>Answer:</h2>

# short sleeved shirts sold  is 50

# long sleeved shirts sold 35

<h2>Step-by-step explanation:</h2>

First, you need to set up the equation.

(5x)+10*(85-x)=600

5x+850-10x=600

-5x+850=600

-5x=600-850

-5x=-250

x=50


After you solve the equation, you know, that 50 short sleeve t-shirts were sold. Now, you need to find out how many long sleeved t-shirts were sold. 85-50=35. Now you know, that there were 35 long sleeved t-shirt sold.

You can now check your answers. 50*5 + 35*10=600

That is correct.

I hoped I helped you. I will be really glad, if you mark my answer with brainliest.

3 0
3 years ago
A line passes through the points (1,1/2) and (3,2) which is the equation of the line
otez555 [7]

Answer:

The equation of the line is y = 3/4x - 1/4

Step-by-step explanation:

To find the equation of this line, start by using the two points with the slope formula to find the slope.

m(slope) = (y2 - y1)/(x2 - x1)

m = (2 - 1/2)/(3 - 1)

m = (3/2)/2

m = 3/4

Now that we have the slope, we can use that and either point in point-slope form to find the equation.

y - y1 = m(x - x1)

y - 2 = 3/4(x - 3)

y - 2 = 3/4x - 9/4

y = 3/4x - 1/4

7 0
3 years ago
Write the main formulas in perimeter and area in 7ty grade
nadya68 [22]

Answer:

  <u>Triangles and Quadrilaterals</u>

  • P = a+b+c . . . . triangle with sides a, b, c
  • P = a+b+c+d . . . . general quadrilateral with side lengths a, b, c, d
  • P = 2(L+W) . . . . rectangle with length L and width W
  • A = 1/2bh . . . . triangle with base b and height h
  • A = (1/2)ab·sin(C) . . . . triangle given sides a, b and included angle C
  • A = √(s(s-a)(s-b)(s-c)) . . . . triangle with sides a, b, c, with s=P/2. "Heron's formula"
  • A = bh . . . . parallelogram with base b and height h. Includes rectangle and square.
  • A = ab·sin(θ) . . . . parallelogram with adjacent sides a, b, and included angle θ
  • A = 1/2(b1+b2)h . . . . trapezoid with parallel bases b1, b2 and height h
  • A = √((s-a)(s-b)(s-c)(s-d)) . . . . area of cyclic quadrilateral with sides a, b, c, d and s=P/2. "Brahmagupta's formula"

  <u>Circles</u>

  • C = πd = 2πr . . . . circumference of a circle of radius r or diameter d
  • A = πr² . . . . area of a circle of radius r
  • A = (1/2)r²θ . . . . area of a circular sector with radius r and central angle θ radians
  • A = 1/2rs . . . . area of a circular sector with radius r and arc length s

  <u>Solids</u> (3-dimensional objects)

  • A = 2(LW +LH +WH) = 2(LW +H(L+W)) . . . . surface area of a rectangular prism of length L, width W, height H
  • A = 4πr² . . . . area of a sphere of radius r

Step-by-step explanation:

<u>Perimeter</u>

The perimeter is the <em>sum of the lengths of the sides</em> of a plane figure. When the sides are the same length, multiplication can take the place of repeated addition. Of course, opposite sides of a parallelogram (includes rhombus, rectangle, and square) are the same length, as are adjacent sides of a rhombus (includes square).

The perimeter of a circle is called it <em>circumference</em>. The ratio of the circumference to the diameter is the same for all circles, a transcendental constant named pi (not "pie"), the 16th letter of the Greek alphabet (π). The value of pi is sometimes approximated by 22/7, 3.14, 3.1416, or 355/113. The last fraction is good to 6 decimal places. It has been calculated to several trillion digits.

<u>Area</u>

Fundamentally, the area of a figure is the product of two orthogonal linear dimensions. For odd-shaped figures, the area can be decomposed into smaller pieces that can be added up. (Calculus is used to do this for areas with irregular boundaries.)

The most common figures for which we find areas are triangles, rectangles, and circles. We sometimes need the area of a fraction of a circle, as when we're computing the lateral area of a cone.

It may help you remember the formulas if you notice the similarity of formulas for area of a triangle and area of a circular sector.

__

Among the formulas above are some that give area when sides and angles are known. The special case of a cyclic quadrilateral (one that can be inscribed in a circle) has its own formula. The similar formula for the area of a triangle from side lengths can be considered to be a special case of the quadrilateral formula where one side is zero.

The formula for area of a trapezoid is somewhat interesting. If the two bases are the same length, the figure is a parallelogram, and the formula matches that for a parallelogram. If one of the bases is zero length, the figure is a triangle, and the formula matches that of a triangle.

In any event, it is useful to note that the area is <em>the product of height and average width</em>. This will be true of <em>any</em> figure — a fact that is used to find the average width in some cases.

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<em>Comment on maximum area, minimum perimeter</em>

A polygon will have the largest possible area for a given perimeter, or the smallest possible perimeter for a given area, if it is a <em>regular</em> polygon. For a quadrilateral, the largest area for a given perimeter is that of a square. For a given perimeter, a regular polygon with more sides will have a larger area.

As the number of sides increases toward infinity, the polygon increasingly resembles a <em>circle</em>, which has the largest possible area for a given perimeter.

3 0
3 years ago
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Aleksandr [31]

Answer:

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Because if you add 12.15 (Taharka + Lamari) and 3.85, it equals 16. The 3.85 comes from 16.00 - 12.15

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