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Nina [5.8K]
2 years ago
13

Find (a) the circumference and (b) the area of the circle. Use $3.14$ or $\frac{22}{7}$

Mathematics
2 answers:
ohaa [14]2 years ago
8 0

Answer:

circumference = 2 \pi r = 2 \times 3.14 \ times 1 = 6.28m\\\\Area = \pi r^2 = 3.14 \times 1 \times 1 = 3.14m^2

inn [45]2 years ago
6 0

Answer:

The answer to your question is  3.14

Step-by-step explanation:

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.03

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2 years ago
Find the sum of the following series
vazorg [7]

Answer:

a) 820

b)450

c)  -540

d) -294

e) 1440

f) 1425

Step-by-step explanation:

a) it is an arithmetic progression with ratio=4

   a1=3,

     a2=3+r=3+4=7.....

    a20=a1+19r

so a20=3+19*4=3+76=79

S=(a1+an)*n/2 where n=20

so S=(3+79)*20/2=820

b) a15=a1+14*r=2+14*4=2+56=58

S=(a1+a15)*15/2=(2+58)*15/2=60*15/2=30*15=450

It is the same formula for all  the exercises

S=(a1+an)*n/2 ,     where n is the number of terms

c) a40=30+39*(-3)=30-87=-57

So S=(30-57)*40/2=-540

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S=(5-47)*14/2=-42*14/2=-42*7=-294

e) it is 5+7+9+......+75

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S=(5+75)*36/2=36*40=1440

f) ratio=7-4=3

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S=(4+91)*30/2=95*30/2=2850/2=1425

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3 years ago
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nikdorinn [45]

Answer:

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Step-by-step explanation:

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