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Answer:
(3,5)
Step-by-step explanation:
Here we are asked to find the reflection of Point P(-1,5) along the line represented by x=1
Please refer to the image attached with answer.
We have point P (-1,5) , the line x=1 and the Point R which is the reflection of P across x=1
now we can see that P is 2 units towards left of the line x=1. hence its reflection across x=1 will be 2 units away towards right of line. 2 units away , the x coordinate will be 1+2 = 3
Hence the x coordinate is 3 and y coordinate remains the same. Hence the coordinates of R will be (3,5)
The cross-section of a sphere is a circle . The area of a circle can be calculated by the formula A= Where r is the radius of the circle.
Given :
Solving for r we have:
Or r= 10.
The area of a sphere is calculated by the formula :
Substituting r value we have:
SA=
The total surface area of this sphere is 400π .