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Lyrx [107]
3 years ago
11

The circumference of a circle is 19.8mm. Find the length of the radius. Give your answer rounded to 1 DP.

Mathematics
1 answer:
Effectus [21]3 years ago
3 0
Circumference of a circle = 2pie*r
= 19.8=2*314*r/100
= 1980 = 628*r
r = 1980/628
r = 3.13
~= 3 cm^2
Hope it helped!!!”!!!
Comment below
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Sladkaya [172]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
Rationalise the denominator.
grin007 [14]

Let's see what to do buddy...

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To do this, we have to multiply the face and denominator of the fraction by the denominator conjunction, which is :

(5 -\sqrt{2})

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Reminder :

(a + b)(a - b) =  {a}^{2} -  {b}^{2}  \\

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So we have :

\frac{1}{ 5-\sqrt{2} } \times  \frac{ 5+\sqrt{2}  }{ 5 +\sqrt{2}  } =  \frac{1 \times ( 5 +\sqrt{2}) }{(5- \sqrt{2} )( 5 +\sqrt{2})  } =  \\

The other is in the photo.

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And we're done.

Thanks for watching buddy good luck.

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7 0
3 years ago
i need help on this problem i know how to do this types of problem but i dont get this problem i need hep thank you
Sever21 [200]

Answer:

B: 72

Step-by-step explanation:

Split the shape into separate rectangles! It will make the problem much easier. You can split it so that you will have a 12 x 3 rectangle and a 6 x 6 rectangle because you subtract 3 from 9 and subtract 6 from 12.

12 x 3 = 36

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Let me know if you're still confused!

8 0
3 years ago
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2 years ago
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I got answer choice A for this one.
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