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3 years ago

11

What is the length of CD in this diagram, ABC - EDC,

2 answers:

natima [27]3 years ago

8 0

Answer:

<h2>4</h2>

Option A is the right option.

solution,

∆ABC~∆EDC

$\frac{bc}{cd} = \frac{ac}{ec} \\ \:$

putting the values,

$\frac{20 - x}{x} = \frac{20}{5} \\ or \: 5(20 - x) = 20x(cross \: multiplication) \\ or \: 100 - 5x = 20x \\ or \: - 5x - 20x = - 100 \\ or \: \: - 25x = - 100 \\ \: or \: x = \frac{ - 100}{ - 25} \\ x = 4$

Hope this helps..

Good luck on your assignment..

Verdich [7]3 years ago

7 0

Answer:

it's 4. I just did this on Apex and the answer was 4

Step-by-step explanation:

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The sum of interior angles of a polygon measures 11,520. How many sides does the polygon have?

Digiron [165]

The sum of angles in a regular n sided polygon:

(n - 2)*180

(n - 2)*180 = 11520

(n - 2) = 11520/180

(n - 2) = 64

n - 2 = 64

n = 64 + 2

n = 66

Polygon has 66 sides.

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3 years ago

45/43 as a percentage rounded to the nearest tenth?

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Step-by-step explanation:

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2 years ago

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Two cones are similar. The surface area of the larger cone is 65π square inches. The surface area of the smaller cone is 41.6π s

devlian [24]

Answer:

8 inches

Step-by-step explanation:

The surface area of a cone (without the base) is given by:

Surface area = pi*r*s

Where r is the base radius and s is the slant height.

The smaller cone has a surface area of 41.6pi in2 and a radius of 6.4 inches, so the slant height is:

41.6pi = pi*r*s

41.6 = 6.4s

s = 6.5 in

If the cones are similar, the radius and the slant height increase in the same proportion, so we have that:

r'/s' = r/s = 6.4/6.5

s' = r'*6.5/6.4

So for the larger cone, we have:

65pi = pi*r'*s'

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3 years ago

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lisabon 2012 [21]

For this case, the first thing you should know is that the opposite sides of the parallelogram are the same.

Therefore, we have the following equations:

$3y-6 = 21\\5x + 2 = 17$

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3 years ago

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makkiz [27]

Answer:

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Step-by-step explanation:

First you must in the formula for the pyramid, which is

$v=\frac{wlh}{3}$

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1.) Plug those numbers into the the equation, which should be:

$(18,069,333.33333)= \frac{(440)h}{3}$

2.) Then isolate the "h" by dividing both sides by $\frac{440}{3}$ , or multiplying its reciprocal, which is $\frac{3}{440}$

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3.) Simplify or round the numbers if you need to.

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3 years ago