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2 years ago

Rectangle perimeter please

Mathematics

2 answers:

-Dominant- [34]2 years ago

3 0

Answer:

624

Step-by-step explanation:

Width: 104

Length: 208

104+104+208+208=624

LenKa [72]2 years ago

3 0

Answer: 624

Step-by-step explanation: We know the width is 104 inches and that the length is twice that. So since 104 times 2 = 208 the length must be 208

to get the perimeter we must add length + length + width + width

so 104 +104+208+208 if we add 104 + 104 =208 so...

208+208+208= perimeter or 208 times 3 = perimeter

so multiply 208 times 3 and you will get 624 which is the perimeter

hope this helps mark me brainliest if it did

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Leviafan [203]

no because she turned it only 90 degrees not 180.

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2 years ago

Find the area of a quadrilateral ABCD in which AB = 3 cm, BC = 4 cm, CD = 4 cm, DA = 5 cm and AC = 5 cm.

melamori03 [73]

Answer:

$6+2\sqrt{21}\:\mathrm{cm^2}\approx 15.17\:\mathrm{cm^2}$

Step-by-step explanation:

The quadrilateral ABCD consists of two triangles. By adding the area of the two triangles, we get the area of the entire quadrilateral.

Vertices A, B, and C form a right triangle with legs $AB=3$ , $BC=4$ , and $AC=5$ . The two legs, 3 and 4, represent the triangle's height and base, respectively.

The area of a triangle with base $b$ and height $h$ is given by $A=\frac{1}{2}bh$ . Therefore, the area of this right triangle is:

$A=\frac{1}{2}\cdot 3\cdot 4=\frac{1}{2}\cdot 12=6\:\mathrm{cm^2}$

The other triangle is a bit trickier. Triangle $\triangle ADC$ is an isosceles triangles with sides 5, 5, and 4. To find its area, we can use Heron's Formula, given by:

$A=\sqrt{s(s-a)(s-b)(s-c)}$ , where $a$ , $b$ , and $c$ are three sides of the triangle and $s$ is the semi-perimeter ( $s=\frac{a+b+c}{2}$ ).

The semi-perimeter, $s$ , is:

$s=\frac{5+5+4}{2}=\frac{14}{2}=7$

Therefore, the area of the isosceles triangle is:

$A=\sqrt{7(7-5)(7-5)(7-4)},\\A=\sqrt{7\cdot 2\cdot 2\cdot 3},\\A=\sqrt{84}, \\A=2\sqrt{21}\:\mathrm{cm^2}$

Thus, the area of the quadrilateral is:

$6\:\mathrm{cm^2}+2\sqrt{21}\:\mathrm{cm^2}=\boxed{6+2\sqrt{21}\:\mathrm{cm^2}}$

4 0

2 years ago

The cafeteria uses rectangular trays with a raised edge around them. The area of the flat surface of each tray is 228 Inches squ

solong [7]

Answer: D 62 inches

Step-by-step explanation: Given area of each tray = 228 in2 inches

7 0

2 years ago

Read 2 more answers

Help me please,Thanks

Alborosie

the formula for volume of a prism is base x height

4 0

2 years ago

in mrs. wallace class's science class, 1/2 of the students are boys. Of the boys , 1/8 are left- handed. what fraction of the st

o-na [289]

Answer:

1/16 of the class are left handed boys but we do not know the amount of left handed girls so we cannot be sure.

Step-by-step explanation:

1/2 * 1/8 = 1/16

there is still no way to be sure of how many girls are left handed so you should probably make a note by the problem so the mistake on the test will be realized

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2 years ago