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3 years ago

13

A rectangular computer screen is 18 in wide and 11 in high. find the length of its diagonal

2 answers:

Blizzard [7]3 years ago

6 0

Since it is a rectangle, that means that all the corners are 90 degrees.

If we take a rectangle and cut it along the diagonal, that is basically two right triangles.

The diagonal is just the hypotenuse of the triangles

To find the hypotenuse

a^2 + b^2 = c^2
18^2 + 11^2 = c^2
324 + 121 = c^2
445 = c^2
c = sqrt. (445)

Hope this helps!

Reptile [31]3 years ago

5 0

I'm not sure if this answer is correct because I haven't done it since 4th grade but I think it's 14 1/2in

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3 years ago

the art club is selling tubo of cookies dough for a fundraiser. how much Will a student earn if he or she sells 24 tus of cookie

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Step-by-step explanation:

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3 years ago

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Help help help math

anygoal [31]

Answer:

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Step-by-step explanation:

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2 years ago

The length of a rectangular flower bed is 2ft longer than the width. If the area is 6ft, then what are the exact length and widt

Marizza181 [45]

Answer:

Exact dimensions:

$width=-1+\sqrt{7}$

$length=-1+\sqrt{7}+2$

$length=1+\sqrt{7}$

Approximate dimensions:

$width=1.64575ft$

$length=1.64575+2$

$length=3.64575ft$

Step-by-step explanation:

Let's assume width of rectangle is w ft

The length of a rectangular flower bed is 2ft longer than the width

so,

length =w+2

$L=w+2$

now, we can find area

$A=L\times W$

now, we can plug it

$A=(w+2)\times w$

$A=w^2+2w$

we are given area =6

so, we can set it equal

and then we can solve for w

$w^2+2w=6$

$w^2+2w-6=0$

we can use quadratic formula

$ax^2+bx+c=0$

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

now, we can compare and find a,b and c

a=1 , b=2 , c=-6

$w=\frac{-2\pm \sqrt{2^2-4\cdot \:1\left(-6\right)}}{2\cdot \:1}$

$w=-1+\sqrt{7},\:w=-1-\sqrt{7}$

we know that dimension can never be negative

so, we will only consider positive value

Exact dimensions:

$width=-1+\sqrt{7}$

$length=-1+\sqrt{7}+2$

$length=1+\sqrt{7}$

Approximate dimensions:

$width=1.64575ft$

$length=1.64575+2$

$length=3.64575ft$

7 0

4 years ago