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3 years ago

7

Work out the surface area of this cylinder

2 answers:

IgorLugansk [536]3 years ago

6 0

Answer:

A=2πrh+2πr2=2·π·2·4+2·π·22≈75.39822

Step-by-step explanation:

Airida [17]3 years ago

4 0

Answer:

A

Step-by-step explanation:

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3 years ago

The side lengths of the following right triangle 15,20 and 25, as shown below. The altitude from the right angle splits the hypo

kompoz [17]

Answer:

$h = 12$

$x = 9$

$y= 16$

Step-by-step explanation:

Given

The attached triangle

Required

Find h, x and y

Let the base of the triangle be 15.

So, the area is:

$A = \frac{1}{2} * 15 * 20$

$i.e\ height = 20$

$A = \frac{1}{2} * 300$

$A = 150$

Let the base of the triangle be 25.

So, the area is:

$A = \frac{1}{2} * 25 * h$

$i.e\ height = h$

$A = \frac{1}{2} * 25h$

Substitute $A = 150$

$\frac{1}{2}*25h = 150$

Solve for h

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$h = 12$

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$Hypotenuse = 15$

So:

$15^2 = h^2 + x^2$

$15^2 = 12^2 + x^2$

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$9 =x$

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Answer:

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Step-by-step explanation:

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