4) The diameter of a circle measures 16 mm. What is the

Mathematics

2 answers:

Nesterboy [21]2 years ago

6 0

Answer:

Step-by-step explanation:

d=16mm

therefore r=8mm

therefore circumference = 2pi r = 2* 3.14*8

=50.42cm

hope it helps

Margaret [11]2 years ago

4 0

Answer: 50.24 mm

Step-by-step explanation:

Circumference= 2πr

C = 2 x 3.14 x 8mm

C = 50.24 mm

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Find two unit vectors orthogonal to both given vectors. i j k, 4i k

Maurinko [17]

The cross product of two vectors gives a third vector $\mathbf v$ that is orthogonal to the first two.

$\mathbf v=(\vec i+\vec j+\vec k)\times(4\,\vec i+\vec k)=\begin{vmatrix}\vec i&\vec j&\vec k\\1&1&1\\4&0&1\end{vmatrix}=\vec i+3\,\vec j-4\,\vec k$

Normalize this vector by dividing it by its norm:

$\dfrac{\mathbf v}{\|\mathbf v\|}=\dfrac{\vec i+3\,\vec j-4\,\vec k}{\sqrt{1^2+3^2+(-4)^2}}=\dfrac1{\sqrt{26}}(\vec i+3\,\vec j-4\vec k)$

To get another vector orthogonal to the first two, you can just change the sign and use $-\mathbf v$ .