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Oksana_A [137]
3 years ago
7

Need Help Fast!!! 10 points!

Mathematics
1 answer:
Aleksandr [31]3 years ago
5 0

EF = 12

Step-by-step explanation:

Step 1 :

The square of side 18 in is divided into 3 parts of equal area by the polygonal chain

So we have

Area of the figure ABCE = Area of the figure AECF = Area of the figure AFCD

Step 2 :

Area of figure ABCE is Area of the triangle AME + Area of the trapezium EMBC

Area of triangle AME = 1/2(ME )(AM) where ME is the base and AM = 9 is the height of the triangle ( AM = 9 since M is the midpoint of AB)

Area of triangle AME = 1/2(ME )9 = 9/2(ME)

Area of the trapezium EMBC = 1/2(ME +BC)(MB) Where ME and BC are the 2  parallel sides and MB is the distance between them

Area of the trapezium EMBC = 1/2(ME+18)9 = 9/2(ME+18)

Therefore

Area of figure ABCE = 9/2(ME) + 9/2(ME+18)

=  9/2(ME +ME+18)

But we know that the area of this figure is 1/3 of the area of the square = 1/3(18*18) = 108

So, 9/2(ME +ME+18) = 108  => 2 ME + 18 = 24 = > ME = 3

Step 3 :

Using the same procedure as above we get, FN = 3

Also we have

ME + EF + FN = 18  ( side of the square)

3 + EF + 3 = 18 => EF = 12

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Step-by-step explanation:

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Answer:

<u>Question 1</u>

F

T

T

The volume of figure A can be found by multiplying (5 · 7)(2).

<u>Question 2</u>

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The total volume of the figure is 442 mm³

<u>Question 3</u>

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The volume of the triangular prism is 108 in³

Step-by-step explanation:

<u>Formula used</u>

Volume of a prism = base area × height

Area of a rectangle = width × length

Area of a triangle = 1/2 × base × height

Volume of a cube = s³  (where s is the side length)

---------------------------------------------------------------------------------------------------

<h3><u>Question 1</u></h3>

⇒ Volume of Figure A = (5 · 7)(2)

                                     = 70 cm³

⇒ Volume of Figure B = (13 · 7)(2)

                                     = 182 cm³

⇒ Total Volume = Volume of Figure A + Volume of Figure B

                           = 70 + 182

                           = 252 cm³

The first statement is false.

<u>Rewritten statement</u>:

The volume of figure A can be found by multiplying (5 · 7)(2).

---------------------------------------------------------------------------------------------------

<h3><u>Question 2</u></h3>

⇒ Volume of rectangular prism = (15 · 15)(2)

                                                    = 450 mm³

⇒ Volume of central cube = 2³

                                            = (2 · 2 · 2)

                                            = 8 mm³

⇒ Total Volume = Volume of rectangular prism - Volume of cube

                           = 450 - 8

                           = 442 mm³

The third statement is false.

<u>Rewritten statement</u>:

The total volume of the figure is 442 mm³

---------------------------------------------------------------------------------------------------

<h3><u>Question 3</u></h3>

⇒ Volume of rectangular prism = (12 · 3)(8)

                                                    = 288 in³

⇒ Volume of triangular prism = (1/2 · 12 · 6)(3)

                                                 = 108 in³

⇒ Total Volume = Volume of rectangular prism + Volume of triangular prism

                           = 288 + 108

                           = 396 in³

The second statement is false.

<u>Rewritten statement</u>:

The volume of the triangular prism is 108 in³

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