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GREYUIT [131]
3 years ago
5

The pythagorean theorem and maps answer key

Mathematics
2 answers:
Nesterboy [21]3 years ago
8 0
I can help u with one question,rest u can do it.
Pythagorean theorem is (hy)^2=(l)^2+(b)^2
Hypotenuse is the lingest side of a triangle

anzhelika [568]3 years ago
8 0

Answer with explanation:

According to Pythagorean Theorem if in a right triangle the two legs of a right triangle are a and b and the hypotenuse is denoted by c then we have:

          c^2=a^2+b^2

Ques 1)

By Pythagorean Theorem we have:

                 (440)^2=(305)^2+a^2\\\\i.e.\\\\193600=93025+a^2\\\\\\a^2=193600-93025\\\\\\a^2=100575\\\\\\a=317.1356\ units

To the nearest tenth we have:   a=317.1

Ques 2)

By Pythagorean Theorem we have:

                 (415)^2=(390)^2+b^2\\\\i.e.\\\\172225=152100+b^2\\\\\\b^2=172225-152100\\\\\\b^2=20125\\\\\\b=141.8626\ units

To the nearest tenth we have:   b=141.9

Ques 3)

By Pythagorean Theorem we have:

c^2=(625)^2+(450)^2\\\\\\c^2=593125\\\\\\c=770.1460

To the nearest tenth we have:   c=770.1

Ques 4)

By Pythagorean Theorem we have:

(515)^2=(380)^2+d^2\\\\\\d^2=120825\\\\\\d=347.5989

To the nearest tenth we have:   d=347.6

Ques 5)

By Pythagorean Theorem we have:

(700)^2=(400)^2+e^2\\\\\\e^2=330000\\\\\\e=574.4562

To the nearest tenth we have:  e=574.4

Ques 6)

By Pythagorean Theorem we have:

(750)^2=(500)^2+f^2\\\\\\f^2=312500\\\\\\f=559.0169

To the nearest tenth we have:   f=559

Ques 7)

By Pythagorean Theorem we have:

(g)^2=(250)^2+(250)^2\\\\\\g^2=125000\\\\\\g=353.5533

To the nearest tenth we have:   g=353.6

Ques 8)

By Pythagorean Theorem we have:

(400)^2=(325)^2+h^2\\\\\\h^2=54375\\\\\\h=233.1844

To the nearest tenth we have:   h=233.2

Ques 9)

By Pythagorean Theorem we have:

(i)^2=(300)^2+(400)^2\\\\\\i^2=250000\\\\\\i=500

To the nearest tenth we have:   i=500

Ques 10)

A Pythagorean triple is the set of three positive integers a,b and c such that it satisfy:

                  c^2=a^2+b^2

Hence, we among the given above options the Pythagorean triple are:

 The last option form i.e. the triangle whose side is 300, 400 and i.

Also, the figure is attached to the answer.

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Maggie graphed the image of a 90 counterclockwise rotation about vertex A of . Coordinates B and C of are (2, 6) and (4, 3) and
Lemur [1.5K]

Answer:

A(2,2)

Step-by-step explanation:

Let the vertex A has coordinates (x_A,y_A)

Vectors AB and AB' are perpendicular, then

\overrightarrow {AB}=(2-x_A,6-y_A)\\ \\\overrightarrow {AB'}=(-2-x_A,2-y_A)\\ \\\overrightarrow {AB}\perp\overrightarrow {AB'}\Rightarrow \overrightarrow {AB}\cdot \overrightarrow {AB'}=0\Rightarrow (2-x_A)(-2-x_A)+(6-y_A)(2-y_A)=0

Vectors AC and AC' are perpendicular, then

\overrightarrow {AC}=(4-x_A,3-y_A)\\ \\\overrightarrow {AC'}=(1-x_A,4-y_A)\\ \\\overrightarrow {AC}\perp\overrightarrow {AC'}\Rightarrow \overrightarrow {AC}\cdot \overrightarrow {AC'}=0\Rightarrow (4-x_A)(1-x_A)+(3-y_A)(4-y_A)=0

Now, solve the system of two equations:

\left\{\begin{array}{l}(2-x_A)(-2-x_A)+(6-y_A)(2-y_A)=0\\ \\(4-x_A)(1-x_A)+(3-y_A)(4-y_A)=0\end{array}\right.\\ \\\left\{\begin{array}{l}-4-2x_A+2x_A+x_A^2+12-6y_A-2y_A+y^2_A=0\\ \\4-4x_A-x_A+x_A^2+12-3y_A-4y_A+y_A^2=0\end{array}\right.\\ \\\left\{\begin{array}{l}x_A^2+y_A^2-8y_A+8=0\\ \\x_A^2+y_A^2-5x_A-7y_A+16=0\end{array}\right.

Subtract these two equations:

5x_A-y_A-8=0\Rightarrow y_A=5x_A-8

Substitute it into the first equation:

x_A^2+(5x_A-8)^2-8(5x_A-8)+8=0\\ \\x_A^2+25x_A^2-80x_A+64-40x_A+64+8=0\\ \\26x_A^2-120x_A+136=0\\ \\13x_A^2-60x_A+68=0\\ \\D=(-60)^2-4\cdot 13\cdot 68=3600-3536=64\\ \\x_{A_{1,2}}=\dfrac{60\pm8}{2\cdot 13}=\dfrac{34}{13},2

Then

y_{A_{1,2}}=5\cdot \dfrac{34}{13}-8 \text{ or } 5\cdot 2-8\\ \\=\dfrac{66}{13}\text{ or } 2

Rotation by 90° counterclockwise about A(2,2) gives image points B' and C' (see attached diagram)

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3 years ago
Graph f(x)=−1.5x+6.<br><br> Use the line tool and select two points to graph the line.
aev [14]

Answer: Points (-1 , 7.5), (0 , 6), and (1 , 4.5).

Step-by-step explanation:

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The two triangles are similar.
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Answer:

x=10

Step-by-step explanation:

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\frac{28}{20}=\frac{4x+2}{3x}

Solve by cross multiplying.

28(3x) = 20(4x+2)

84x = 80x + 40

4x = 40

x=10

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(-2, 1)

Step-by-step explanation:

Systems of equations can be solved using different methods.  For this set of systems, you can multiply each equation by a factor in order to eliminate a variable and solve for the other variable:

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5(-3x - 4y = 2)  or <u>-15x -20y = 10</u>

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Solve for x:  -5x - 3 = 7

Add 3 to both sides:  -5x -3 + 3 = 7 + 3 or -5x = 10

Solve for x: x = -2

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