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joja [24]
3 years ago
12

Which of these statements is true?

Mathematics
1 answer:
Talja [164]3 years ago
8 0

Answer:

B all square are regular polygons

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Suppose, for each triangle in the diagram, the measurements that are labeled are known, while the other measurements are unknown
Hunter-Best [27]

<span>To use Law of Cosines, you need to know an angle and two sides. 
The simplest case is if you know two sides (a and b) and the included angle (C) 
c² = a² + b² − 2ab cos(C) 
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cos(B) = (a² + c² − b²) / (2ac) 

You can also use Law of Cosines if you know 2 sides (b and c), and non-included angle (C). We use first equation above, solving for a. Since the equation is a quadratic (with respect to unknown variable a), it is simpler to use Law of Sines in this case. 

You can also use Law of Cosines if you know the 3 sides (a,b,c) 
cos(A) = (b² + c² − a²) / (2bc) 
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Artist 52 [7]
1. Corresponding

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The total surface area of a hemisphere is 45<br><img src="https://tex.z-dn.net/?f=%5Cpi%5Cp" id="TexFormula1" title="\pi\p" alt=
rjkz [21]

Answer:

The volume of the hemisphere  

       V = 121.33086 cubic centimeter

Step-by-step explanation:

<u>Step(i)</u>:-

Given that the total surface area of a hemisphere = 45π cm²

<em> The total surface area of a hemisphere = 3π r²</em>

Equating

              3π r² = 45π

                   r^{2} = \frac{45}{3} =15

                    r = \sqrt{15} = 3.87

The radius of the sphere 'r' = 3.87

<u><em>Step(ii):-</em></u>

<em>The volume of the hemisphere</em>

                 V = \frac{2}{3} \pi r^{3}

                V = \frac{2}{3} \pi (3.87)^{3}

we know that   π = 3.14

                V = \frac{2}{3}  (3.14) (3.87)^{3}

               V = 121.33086 cubic centimeter

               

         

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3 years ago
Circle―r = 4 cm find the area
rusak2 [61]
Are of circle = πr² = 22/7 *4*4 = 50.27cm²
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