Question

3) If the circumference of a circular sheet is 154m, find its radius. Also find the area of the sheet . ( Take π= 22/7)
4) A gardener wants to fence a circular garden of diameter 21m . Find the length of the rope he needs to purchase, if he makes 2 rounds of fence .Also find the coust of the rope, if it costs Rs- 4 per metre.( Take π = 22/7).

5)From circular sheet of radius 4cm, a circle of radius 3 cm is removed. Find the area of the remaining sheet.(Take π = 3.14)
6) Samima wants to put a lace on the edge of a circular table cover of diameter 1.5m. Find the length of the lace required & also find its cost if one metre of the lace costs Rs- 15 .( Take π =3.14 )
7) Find the perimeter of the adjoining figure, which is a semicircle including its diameter.

8) Find the cost of polishing a circular table-top of diameter 1.6m, if the rate of polishing is Rs- 15/m². ( Take π=3.14)

9) Shazli took a wire of length 44cm & bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure enclosed more area , the circle or the square?(Take π = 22/7 ) .

10) Form a circular card sheet of radius 14cm, two circles of radius 3.5cm & a rectangle of length 3cm & breadth 1cm are removed.( as shown in the adjoining figure ). Find the area of the remaining sheet.( Take π = 22/7).

11) A circle of radius 2cm is cut out form a square piece of an aluminium sheet?( Take π = 3.14)

12) The circumference of a circle is 31.4cm . Find the radius & the area of the circle? ( Take π =3.14 )

13) A circular flower bed is surrounded by a path 4m wide . The diameter of the flower bed is 66m. What is the area of this path ?( π = 3.14 )

14) A circular flower garden has an area of 314m². A sprinkler at the centre of the garden can area that has a radius of 12m. Will the sprinkler water the entire garden? ( Take π = 3.14 )

15) Form a circular card sheet of radius 56cm, 4 circle radius 10.5cm & two rectangle of length 11cm & breadth 2cm are removed. Find the area of the remaining sheet?

Please give answers step by step .
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Answer 1

Answer:

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Such reactions are represented by equations of the following form: X + Y → XY. The combination of two or more elements to form one compound is called combination reaction

Answer 2

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Circumference of the circular sheet=154m

⇒2πr=154m

⇒r=$\frac{154}{2π}$

⇒r=$\frac{154×7}{2×22}$=24.5m

Now, Area of circular sheet=$πr^2$

=$\frac{22}{7}$×24.5×24.5

=22×3.5×24.5=$1886.5 m^2$

Thus, the radius and area of circular sheet are 24.5m and $1886.5 m^2$respectively.