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aniked [119]
3 years ago
15

A right cylinder has a radius of 3 and a height of 12. what is its surface area?

Mathematics
2 answers:
tester [92]3 years ago
8 0

The surface area is 90pi

Katarina [22]3 years ago
3 0

Answer:

Surface area of cylinder = 282 .6 square units.

Step-by-step explanation:

Given : A right cylinder has a radius of 3 and a height of 12.

To find : what is its surface area

Solution : We have given that  radius =  3

Height = 12.

Surface area of cylinder =  2πr ( r +h)

Surface area of cylinder =  2 *3.14 * 3 ( 3 +12)

                                        = 18.84 (15)

Surface area of cylinder = 282 .6 square units.

Therefore, Surface area of cylinder = 282 .6 square units.

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A line of roses forms the diagonal of a rectangular flower garden. Th e line of roses is 18.4 m long, and one side of the garden
professor190 [17]
Given that the garden is rectangular and a line of roses form the diagonal 18.4 m long, we required to calculate the length of the perpendicular side.
Here we shall use the Pythagorean theorem.
c²=a²+b²
where c is the hypotenuse, a and b are the legs.
from the information given:
c=18.4 m
a=13 m
plugging this into our expression we get:
18.4²=13²+b²
next we solve for the value of b
b²=18.4²-13²
b²=338.56-169
b²=169.56
b=√169.56
b=13.0215
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A blue whale calf weighed 2725 kilograms at birth. A blue whale calf gains 90 kilograms of weight each day for the first 240 day
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Answer:the weight after 225 days is

22885 kilograms

Step-by-step explanation:

The initial weight of the blue whale calf at birth is 2725 kilograms. blue whale calf gains 90 kilograms of weight each day for the first 240 days after its birth. The weight increases in arithmetic progression. This means that the first term of the sequence, a is 2725, the common difference, d is 90.

The formula for the nth term of an arithmetic sequence is expressed as

Tn = a + (n - 1)d

Where

n is the number of terms of the sequence.

a is the first term

d is the common difference

We want to determine its weight, T225 after 225 days after it’s birth. It means that n = 225

Therefore

T225 = 2725 + (225 - 1)90

T225 = 2725 + 224×90 = 2725 + 20160

T225 = 22885

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