Find the surface area of a sphere with a radius of 8cm.

Mathematics

2 answers:

Tcecarenko [31]3 years ago

3 0

The answer is B 803.8cm^2

r-ruslan [8.4K]3 years ago

3 0

By definition, the surface area of a sphere is given by:

$A = 4 * \pi * r ^ 2$

Where,

r: sphere radius

Substituting values in the given equation we have:

$A = 4 * 3.14 * 8 ^ 2$

Doing the calculations we have:

$A = 803.84$

Rounding to the nearest tenth:

$A = 803.8 cm ^ 2$

Answer:

The surface area of a sphere with a radius of 8cm is:

B. 803.8 cm ^ 2

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Hazel knits 5 centimeters of scarf eachnight. After 5 nights of knitting, how manycentimeters of scarf will Hazel have knit into

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SOLUTION

Problem Statement

We are told Hazel knits 5 centimeters of scarf every night for 5 nights. We are required to find the length of the scarf Hazel will have knitted after 5 nights.

Solution

We are told Hazel makes 5 centimeters of scarf every night. Thus, for each night up till 5 nights, we just need to add the length of scarf Hazel has made.

Let us count for each night.

Night 1:

Hazel makes 5 centimeters of the scarf.

Night 2:

Hazel makes extra 5 centimeters, which means she has made: