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3 years ago

Can someone explain how you got the answer!!

Mathematics

1 answer:

gavmur [86]3 years ago

6 0

9514 1404 393

Answer:

20 square units

Step-by-step explanation:

The area is given by the formula ...

A = bh

where b is the base of the parallelogram, and h is the perpendicular distance between the parallel bases. Using the numbers from the figure, we have ...

A = 5·4 = 20 . . . . square units

_____

Additional comment

You will notice this is the same formula as is used for a rectangle. You can consider the parallelogram to have the same area as a rectangle of these dimensions if you look at what happens when you cut the right triangle from the right end and add it to the left end. The result is a rectangle 5 units wide and 4 units high.

The same formula applies even if the skew is so great that the bases do not overlap. (That much skew would not result in a triangle of the kind shown in this diagram.)

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Use a net to find the surface area of the open cylinder with only one base. Use 3.14 for pi.

Mandarinka [93]

Answer:

251.20 cm square

Step-by-step explanation:

As given in figure

height of cylinder = 2 cm

radius of cylinder = 8 cm

lateral surface area of cylinder is given by = $\pi r l$

where r is the radius and l is the height

Therefore, lateral surface area of given cylinder

$\pi r l = 3.14*8*2 = 50.24$

area of base is give by $\pi r^2$

since there is only one base area of that base

= $\pi r^2 = 3.14*8^2 = 3.14*64 = 200.96$

Thus,

Total surface area of open cylinder = 50.24 + 200.96 = 251.20 cm square

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