What will be the new position of the point (−8, 4) when rotated through 90° anti- clockwise about the origin?
i. (−4, −8)
ii. (−4, 8)
iii. (4, 8)
iv. (2, 4)

we have

(x,y). rotation through 90° anti-

clockwise about the origin(-y,x)

point (−8, 4) when rotated through 90° anti-

clockwise about the origin(-4,-8)

Option.i. (−4, −8)

Step-by-step explanation:

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80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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