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3 years ago

Ben was framing a small herb garden for his mother. He

Mathematics

2 answers:

Leto [7]3 years ago

6 0

1350 just multiply 30x45 and that the sender

kozerog [31]3 years ago

4 0

Answer:

1350 inches

Step-by-step explanation:

Ben was framing a small herb garden for his mother .

He wants garden to be 30 inches long and 45 inches wide.

So,

Length of a small herb garden framed by Ben for his mother = 30 inches

Breadth of a small herb garden framed by Ben for his mother = 45 inches

We need to find the dimensions of a piece of wood that Ben will need to purchase to frame the garden.

As the garden is in the shape of rectangle, it's area = length × breadth

So, area of piece of wood that Ben will need to frame the garden = 30 inches × 45 inches = 1350 inches

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The curves r1(t) = 2t, t2, t4 and r2(t) = sin t, sin 5t, 2t intersect at the origin. Find their angle of intersection, θ, correc

masya89 [10]

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Therefore the angle of intersection is $\theta =79.48^\circ$

Step-by-step explanation:

Angle at the intersection point of two carve is the angle of the tangents at that point.

Given,

$r_1(t)=(2t,t^2,t^4)$

and $r_2(t)=(sin t , sin5t, 2t)$

To find the tangent of a carve , we have to differentiate the carve.

$r'_1(t)=(2,2t,4t^3)$

The tangent at (0,0,0) is [ since the intersection point is (0,0,0)]

$r'_1(0)=(2,0,0)$ [ putting t= 0]

$|r'_1(0)|=\sqrt{2^2+0^2+0^2} =2$

Again,

$r'_2(t)=(cos t ,5 cos5t, 2)$

The tangent at (0,0,0) is

$r'_2(0)=(1 ,5, 2)$ [ putting t= 0]

$|r'_1(0)|=\sqrt{1^2+5^2+2^2} =\sqrt{30}$

If θ is angle between tangent, then

$cos \theta =\frac{r'_1(0).r'_2(0)}{|r'_1(0)|.|r'_2(0)|}$

$\Rightarrow cos \theta =\frac{(2,0,0).(1,5,2)}{2.\sqrt{30} }$

$\Rightarrow cos \theta =\frac{2}{2\sqrt{30} }$

$\Rightarrow cos \theta =\frac{1}{\sqrt{30} }$

$\Rightarrow \theta =cos^{-1}\frac{1}{\sqrt{30} }$

$\Rightarrow \theta =79.48^\circ$

Therefore the angle of intersection is $\theta =79.48^\circ$ .

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3 years ago