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Nat2105 [25]
3 years ago
14

Help please quick!! Find the area of the regular nonagon.

Mathematics
1 answer:
stealth61 [152]3 years ago
7 0
It’s c I’m in college 100% c
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Can someone help please.
snow_lady [41]
<span>By the Pythagorean theorem
AB = </span>√(12²+5²) = √169 = 13 units

\frac{AD}{AB} =  \frac{BD}{BC} \ \to \ BC= \frac{AB*BD}{AD}= \frac{13*12}{5}=   31.2 \ units
8 0
3 years ago
Jeff's mother gave him money. he used an equal amount of money each day. at the end of the 7th day, he was left with 1/4 of how
skelet666 [1.2K]

Jeff received 280$ from his mother

Such questions are the simplest as it needs you to just write the conditions accordingly which then simplifies and provides you the answer.

This question can be solved using two tricks which are shown below:-

Trick  1 :

1 – 1/4 = 3/4 (used for the 1st 7 days)

1/4 – 410 (used for 8th and 9th days)

(3/4)/7 ——- (1/4 – 10)/2

(3/4) x (2/7) = 3/14 ——- (1/4 – 10)

1/4 – 3/14 = (7 – 6)/28 = 1/28 ——- 10

28/28 ——- 10 x 28 =$ 280

Trick 2 :

7 days ——- 3/4

1 day ——- 3/28

2 days ——- 6/28

6/28 ——- (1/4 – 10) = 7/28 – 410

1/28 ——- 10

28/28 ——- 10 x 28 = $280

Thus Jeff received 280$ from his mother.

Learn more about simple math here :

brainly.com/question/23678

#SPJ4

4 0
2 years ago
(a+b-c)-(b-a-c)<br><br> I NEED IT RN FOR A TEST OR ELSE I AM DEAD FOR LIFE
Zepler [3.9K]

Answer:

<h2><em><u>2a</u></em></h2>

Step-by-step explanation:

(a+b-c)-(b-a-c)

= a + b - c - b + a + c

= a + a + b - b - c + c

= <em><u>2a (Ans)</u></em>

5 0
3 years ago
Read 2 more answers
Find the length of the arc.
Arte-miy333 [17]
  • radius=r=7in
  • Angle=135°

We know

  • Length if arc=L

\boxed{\sf L=\dfrac{\theta}{360}\times 2πr}

\\ \sf\longmapsto L=\dfrac{135}{360}\times2π(7)

\\ \sf\longmapsto L=\dfrac{27}{72}\times 14π

\\ \sf\longmapsto L=\dfrac{27}{36}\times 14π

\\ \sf\longmapsto L=\dfrac{9}{12}\times 7π

\\ \sf\longmapsto L=\dfrac{63π}{12}

\\ \sf\longmapsto L=\dfrac{21π}{4}in

6 0
3 years ago
Please help ,this is the third time that i ha posted thi question
klio [65]
The answer is 14+8.125π units².
3 0
3 years ago
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