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3 years ago

If the sum of the interior angles of a polygon is 1800 how many sides does it have?

Mathematics

2 answers:

kenny6666 [7]3 years ago

7 0

Answer:

It is a dodecagon, so there are 12 sides.

Step-by-step explanation:

GREYUIT [131]3 years ago

6 0

Answer:

there are 12 sides

please give this the brainliest

Step-by-step explanation:

it is a dodecagon...so the second one

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find the surface area of a right regular hexagonal pyramid with sides 3 cm and slant heights 6cm. show all of your work.

DedPeter [7]

Answer:

The surface area of right regular hexagonal pyramid = 82.222 cm³

Step-by-step explanation:

Given as , for regular hexagonal pyramid :

The of base side = 3 cm

The slant heights = 6 cm

Now ,

The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times a^{2} + 3 a \sqrt{h^{2}+ 3\times \frac{a^{2}}{4}}$

Where a is the base side

And h is the slant height

So, The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times 3^{2} + 3 \times 3 \sqrt{6^{2}+ 3\times \frac{3^{2}}{4}}$

Or, The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times 9 + 9 \sqrt{36+ 3\times \frac{9}{4}}$

Or, The surface area of right regular hexagonal pyramid = 23.38 + 9 × $\frac{171}{4}$

∴ The surface area of right regular hexagonal pyramid = 23.38 + 9 × 6.538

I.e The surface area of right regular hexagonal pyramid = 23.38 + 58.842

So, The surface area of right regular hexagonal pyramid = 82.222 cm³ Answer

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4 years ago

18 minus 7 x = negative 20.5 What is the value of x? Negative 5 and one-half Negative StartFraction 5 Over 14 EndFraction StartF

alisha [4.7K]

Answer:

x = 5.5 (Fraction 5 and one-half)

Step-by-step explanation:

18 - 7x = -20.5

-18 -18

-7x = -38.5

/-7 /-7

x = 5.5

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