A1 = (1, -2 , 0) ; a2 = (0,1,2) ; a3 = (5,-6,8) ; b = (2,-1,6)
2*a1 = (2, -4,0)
3*a2 = (0, 3, 6)
-------------------
sum = (2, -1, 6) = b
Hope this helps
The area of the window is
The shape of the Norman window is described as a rectangle surmounted by a semicircle.
Let 'x' be the width of the window.
Then this width corresponds to the diameter of the semicircle.
That is, radius of the semicircle = x/2
Now given the perimeter of the whole window = 25 ft
This perimeter is equal to the sum of 3 sides of the rectangle and the perimeter of the semicircle.
Perimeter of the semicircle = , where r is the radius of the semicircle.
Now let 'y' be the length of the window.
Then sum of three sides of the window = 2y + x
So 2y + x + = 25
Therefore,
Area of the window = Area of the semicircle + Area of the rectangle =
So Area of the window =
Learn more about area of circle and rectangle at brainly.com/question/4694841
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When we rotate a figure and there is no change in the shape of the figure then it has rotational symmetry.
We know that the order of rotation for a square is 4.
Hence, we have
Thus, the angle of rotational symmetry of square are
Hence, the minimum angle of rotational symmetry is
Therefore, the minimum angle of rotational symmetry for a square is 90 degrees.
Answer:
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Step-by-step explanation:
i guess its A or b
like the heck