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Nataly_w [17]
3 years ago
15

Which polygon appears to be regular?

Mathematics
2 answers:
vaieri [72.5K]3 years ago
7 0
Figure A because all sides appear to be the same length
Kitty [74]3 years ago
4 0

Answer:

Figure A is regular polygon.

Step-by-step explanation:

We are given four different figure. We need to select one regular figure.

Regular Polygon: It is figure whose sides, angles and exterior angles are equal.

Figure A: It is square of two dimensional figure. Square is regular figure.

It is regular polygon.

Figure B: It is shape of parallelogram whose opposite sides are parallel and equal. But adjacent sides are unequal. hence, It's not regular polygon.

Figure C: It is right angle triangle. Right angle triangle never be regular polygon. because all three sides are not equal.

Figure D: It is trapezoid. Trapezoid never be a regular polygon because their opposite sides never be equal.

Hence, Figure A is regular polygon.

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Erica solved the equation −5x − 25 = 78; her work is shown below. Identify the error and where it was made. (5 points)
NemiM [27]
If you would like to solve the equation -5x - 25 = 78, you should do this using the following steps:

<span>-5x - 25 = 78
</span>-5x - 25 + 25 = 78 + 25
-5x + 0 = 103
-5x = 103 /(-5)
x = 103 / (-5)
x = - 103/5 = - 20.6

The error was already made at step 1.
7 0
3 years ago
Read 2 more answers
I just need no. a please help me to prove this. ​
OleMash [197]

Answer:  see proof below

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

Given: A + B + C = π    and         cos A = cos B · cos C

scratchwork:

  A + B + C = π

               A = π - (B + C)

         cos A = cos [π - (B + C)]                              Apply cos

                    = - cos (B + C)                                    Simplify

                    = -(cos B · cos C - sin B · sin C)          Sum Identity

                    = sin B · sin C - cos B · cos C               Simplify

cos B · cos C = sin B · sin C - cos B · cos C               Substitution

2cos B · cos C = sin B · sin C                                        Addition

                     2=\dfrac{\sin B\cdot \sin C}{\cos B \cdot \cos C}                                     Division

                     2 = tan B · tan C

\text{Use the Sum Identity:}\quad \tan(B+C)=\dfrac{\tan B+\tan C}{1-\tan B\cdot \tan C}

<u>Proof LHS → RHS</u>

Given:                              A + B + C = π

Subtraction:                     A = π - (B + C)

Apply tan:                  tan A = tan(π - (B + C))

Simplify:                               = - tan (B + C)

\text{Sum Identity:}\qquad \qquad \qquad =-\bigg(\dfrac{\tan B+\tan C}{1-\tan B\cdot \tan C}\bigg)

Substitution:                        = -(tan B + tan C)/(1 - 2)

Simplify:                               = -(tan B + tan C)/-1

                                            = tan B + tan C

LHS = RHS:   tan B + tan C = tan B + tan C  \checkmark

5 0
3 years ago
PLEASE HELPPPPPPPPP!!!!?!?! ASAP WILL GIVE BRAINLIEST IF CORRECT PLSSS AND THANK YOU.
Assoli18 [71]

Answer:

square root of 14

Step-by-step explanation:

square root of 7 to the square is 7

7+7 = 14

square root of 14 can't be simpliflied

8 0
3 years ago
David inherited some money from his uncle. He invested half of the money with Bernie
ValentinkaMS [17]
Given:
Let x be the whole amount inherited.
1/2 * x - invested with Bernie Madoff
1/3 * x - lost due to identity theft
1/8 * x - lost in casino
40,000 - remainder

x - x/2 - x/3 - x/8 = 40,000

LCM: 
2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
3: 3, 6, 9, 12, 15, 18, 21, 24
8: 8, 16, 24, 

   x * 24/24 = 24x / 24
x/2 * 12/12 = 12x / 24
x/3 *   8/8   = 8x / 24
x/8 *   3/3   = 3x / 24
40,000 * 24/24 = 960,000 / 24

24x/24 - 12x/24 - 8x/24 - 3x/24 = 960,000/24
(24x - 12x - 8x - 3x)/24 = 960,000/24
x/24 = 960,000/24
24 * x/24 = 24 * 960,000/24
x = 960,000

x = 960,000 initial inheritance
x/2 = 960,000/2 = 480,000 invested with Bernie Madoff
x/3 = 960,000/3 = 320,000 lost due to identity theft
x/8 = 960,000/8 = 120,000 lost in the casino
40,000 - remaining amount.

960k - 480k - 320k - 120k = 40k
40k = 40k
 
3 0
3 years ago
An irregular polygon is shown below: Image of irregular polygon with length of 7 units and height of 3 units labeled on left sid
torisob [31]
I don’t see the image can you please add one to the comments so I can answer it. Thanks
7 0
3 years ago
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