Question

A circular flower bed has a circumference of 64 m. What is the radius?

Find the area of the following circles:
i. radius 3 cm
ii. radius 4cm
iii. radius 7 cm
iv. diameter 28 cm

Answer 1

Answer:

circumference = 64m

$but \: circumference = 2\pi \: r \\ so \: \: 64 = 2 \times \frac{22}{7} r \\ \frac{64 \times 7}{2 \times 22} = r \\ r = \frac{112}{11} = 1.18$

Others also can be done by formula of area of circle,i.e, area= pi r (square) . Try them yourself buddy

Hope it helps u :)

Answer 2

Answer:

$\star\large\mathcal{\underline{\underline{PLEASE \: }}}\large\mathcal\red{\underline{\underline{F}}}\large\mathcal\green{\underline{\underline{OLL}}}\large\mathcal\pink{\underline{\underline{OW \: }}}\large\mathcal\blue{\underline{\underline{ME}}}\star$

Step-by-step explanation:

$ANSWER \: \: of \: Part \: I :$

$given , \: circumference \: \\ of \: Circle = \: 64m$

$let \: , the \: radius \: of \: the \: circle \: be \: r.$

$circumference \: of \: Circle = 2πr$

$= 2× \frac{22}{7} ×r = 64$

$= \frac{44}{7} ×r = 64$

$= 44×r = 64×7$

$= r = \frac{448}{44}$

$=> r = 10.18m$

$ANSWER \: \: of \: Part \: II :$

$(i) here , \: radius. = 3cm$

$Area \: of \: Circle = πr²$

$=> \frac{22}{7} ×(3)²cm²$

$= \frac{22}{7} ×9cm²$

$= \frac{198}{7} cm²$

$= 28.28cm²$

$(ii) \: here , \: radius. = 4cm$

$Area \: of \: Circle = πr²$

$=> \frac{22}{7} ×(4)²cm²$

$= \frac{22}{7} ×16cm²$

$= \frac{352}{7} cm²$

$= 50.28cm²$

$(iii) here , \: radius. = 7cm$

$</p><p>Area \: of \: Circle = πr²$

$=> \frac{22}{7} ×(7)²cm²$

$= \frac{22}{7} ×49cm²$

$= 22×7cm²$

$= 154cm²$

$(iv) here , radius. = \frac{28}{2} cm = 14cm$

$Area \: of \: Circle = πr²$

$=> \frac{22}{7} ×(14)²cm²$

$= \frac{22}{7} ×196cm²$

$= 22×28cm²$

$= 616cm²$

$please \: like \: my \: answer \\ \&\\ mark \: me \: brainliest \: please \: :)))$

$\star\large\mathcal{\underline{\underline{PLEASE \: }}}\large\mathcal\red{\underline{\underline{F}}}\large\mathcal\green{\underline{\underline{OLL}}}\large\mathcal\pink{\underline{\underline{OW \: }}}\large\mathcal\blue{\underline{\underline{ME}}}\star$

$\star \: i \: hope \: you \: will \: understand \: me\star$