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4 years ago

15

What is the surface area, in cm^2 of the figure? please help with my homework:)

1 answer:

Ymorist [56]4 years ago

5 0

Consider this option:
S=15.6*2+23*6*3=31.2+414=445.2 cm²

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In circle O, what is mAE?<br> 84°<br> 96°<br> 120°<br> 168°

shutvik [7]

The answer is 120 degrees on edgenutiy<span />

7 0

3 years ago

Read 2 more answers

Triangle $ABC$ has side lengths $AB = 9$, $AC = 10$, and $BC = 17$. Let $X$ be the intersection of the angle bisector of $\angle

Lera25 [3.4K]

Answer:

$\dfrac{72}{19}$

Step-by-step explanation:

Consider triangle ABC. Segment AX is angle A bisector. Its length can be calculated using formula

$AX^2=\dfrac{AB\cdot AC}{(AB+AC)^2}\cdot ((AB+AC)^2-BC^2)$

Hence,

$AX^2=\dfrac{9\cdot 10}{(9+10)^2}\cdot ((9+10)^2-17^2)=\dfrac{90}{361}\cdot (361-289)=\dfrac{90}{361}\cdot 72=\dfrac{6480}{361}$

By the angle bisector theorem,

$\dfrac{AB}{AC}=\dfrac{BX}{XC}$

So,

$\dfrac{9}{10}=\dfrac{BX}{17-BX}\Rightarrow 153-9BX=10BX\\ \\19BX=153\\ \\BX=\dfrac{153}{19}$

and

$XC=17-\dfrac{153}{19}=\dfrac{170}{19}$

By the Pythagorean theorem for the right triangles AXY and CXY:

$AX^2=AY^2+XY^2\\ \\XC^2=XY^2+CY^2$

Thus,

$\dfrac{6480}{361}=XY^2+AY^2\\ \\\left(\dfrac{170}{19}\right)^2=XY^2+(10-AY)^2$

Subtract from the second equation the first one:

$\dfrac{28900}{361}-\dfrac{6480}{361}=(10-AY)^2-AY^2\\ \\\dfrac{22420}{361}=100-20AY+AY^2-AY^2\\ \\\dfrac{1180}{19}=100-20AY\\ \\20AY=100-\dfrac{1180}{19}=\dfrac{1900-1180}{19}=\dfrac{720}{19}\\ \\AY=\dfrac{36}{19}$

Hence,

$XY^2=\dfrac{6480}{361}-\left(\dfrac{36}{19}\right)^2=\dfrac{6480-1296}{361}=\dfrac{5184}{361}\\ \\XY=\dfrac{72}{19}$

4 0

3 years ago

I am having trouble getting started with this question.

loris [4]

Answer:

A= 27/8 feet

B= 21/4 feet

Step-by-step explanation:

<em>First, on both we need to convert to common denominators:</em>

<u><em>A.</em></u>

<u>Multiply:</u>

4 1/4 times 2= 4 2/8

<em>now we have to make 4 2/8 an improper fraction:</em>

4 times 8=32, 32+2=34

34/8

<u>Subtract the below ground length from the total length:</u>

34/8-7/8= <em><u>27/8</u></em>

<u>Repeat:</u>

<em><u>B.</u></em>

<u>Multiply:</u>

1 1/2 times 2= 1 2/4

<em>Now we have to make 1 2/4 and 6 3/4 improper fractions:</em>

1 times 4=4+2=6

6/4

6 times 4-24+3=27

27/4

<u>Subtract the below ground length from the total length:</u>

27/4-6/4= <em><u>21/4</u></em>

i hope this helps u pls give a brainliest and a thx ;)

8 0

4 years ago

HELPPPPPPPPPPPPPPPPPPPP

Oliga [24]

Answer:

765

Step-by-step explanation:

ad both side of the polygon which you will get 17 and 45 times those two and you'll $765ft^2\\$

8 0

2 years ago

I need help. Someone please figure it out

harkovskaia [24]

Answer:

$\frac{1}{2^{n} }$

Step-by-step explanation:

The rules of exponents state that

$a^{-m}$ = $\frac{1}{a^{m} }$ and $a^{0}$ = 1

Thus

$2^{-5}$ = $\frac{1}{2^{5} }$ = $\frac{1}{32}$

$2^{-4}$ = $\frac{1}{2^{4} }$ = $\frac{1}{16}$

$2^{-3}$ = $\frac{1}{2^{3} }$ = $\frac{1}{8}$

and so on , to

$2^{0}$ = 1

7 0

3 years ago