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Leviafan [203]
3 years ago
13

Find the area of the regular 18-gon with radius 10 mm

Mathematics
1 answer:
777dan777 [17]3 years ago
3 0

Answer:

Step-by-step explanation:

Find the area of the regular 18-gon with radius 10 mm

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The area of a cross section through the center of a sphere is 46 square inches. Find the surface area of the sphere.
gavmur [86]

Answer:

184 in.^2

Step-by-step explanation:

The cross section through the center of a sphere is a circle whose radius is equal to the radius of the sphere.

area of circle

A_{circle} = \pi r^2

\pi r^2 = 46

r^2 = \dfrac{46}{\pi}

r = \sqrt{\dfrac{46}{\pi}}

r = 3.83 ~in.

surface area of sphere

SA = 4 \pi r^2

SA = 4 \times \pi \times (3.83)^2

SA = 184~in.^2

7 0
3 years ago
If the nucleus of an atom contains 12 protons, how many electrons are there in a neutral atom?
Cloud [144]

Answer:

An atom of sodium has 11 proton, 11 electrons, and 12 neutrons.

3 0
3 years ago
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BC =<br> Round your answer to the nearest hundredth.<br> ?<br> C<br> B<br> 50°<br> 7<br> А
umka21 [38]

Answer:

The answer is 8.34

U have to use the SOH CAH TOA method

In this case I used tan

so,

tan 50= BC/7

solve for BC= 7* tan 50= 8.34

6 0
3 years ago
Pedro buys 4 books at the fair for $7 each. Pedro hands the cashier 3 ten dollar bills. how much change would he receive? write
garik1379 [7]
4 x 7 = 28 - 30 = -2. His change is 2 dollars.
8 0
4 years ago
The triangular prism and the triangular pyramid shown have the same base and the same height. Use the drop-down menus to complet
Mila [183]
A triangular prism Vol. = area (A) of the triangular base × height (h) of prism
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3 years ago
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