Question

A sprinkler placed at the centre of a flower garden sprays water covering a circular area .If the area watered is 1386cm sq ,find its radius and diameter​

Answer 1

Answer:

Area of the circle = πr2 sq.units Area of the circular portion watered = 1386 cm2 πr2 = 1386 22 7 227 x r2 = 1386 r2 = 1386 x 7 22 722 = 63 x 7 = 9 x 7 x 7 r2 = 32 x 72 r = 3 x 7 Radius (r) = 21 cm Diameter (d) = 2r = 2 x 21 cm Diameter (d) = 42 cmRead more on Sarthaks.com - https://www.sarthaks.com/995179/sprinkler-placed-centre-flower-garden-sprays-water-covering-circular-area-watered-1386

Answer 2

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Step-by-step explanation:

Area of the circle =

$\pi \: {r}^{2} sq \: units$

Area of the circular portion watered = 1386cm²

$\pi \: {r}^{2} = 1386$

$\frac{22}{7} \times {r}^{2} = 1386$

${r}^{2} = 1386 \times \frac{22}{7}$

$= 63 \times 7$

$= 9 \times 7 \times 7$

${r}^{2} = {3}^{2} \times {7}^{2}$

$r = 3 \times 7$

Radius (r) = 21cm

Diameter (d) = 2r

= 2 × 21 cm

Diameter (d) = 42 cm