Question

I will give Brainiest, for this question , Qu. 8 or 9

Answer 1

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Answer 2

A8)

Volume of sphere = 4/3 πr³

Find the volume:

Volume of the sphere = 4/3 π (9)³

Volume of the sphere = 972π cm³

Find the radius:

Radius = Diameter ÷ 2

Radius = 4 ÷ 2

Radius = 2mm = 0.2 cm

Find the length of the wire:

πr²h = Volume

π(0.2)² h = 972π

0.04πh = 972π

h = 972π ÷ 0.04π

h = 24300 cm

Answer: The length of the wire is 24300 cm

A9)

It is given that ,

Area of the sector ( A ) = 15π sq cm

Radius of the circle ( r ) = 6 cm

We know that ,

1 ) Area of the sector ( A ) = ( x°/360 ) × πr²

Where , x is sector angle ,

2 ) length of the arc ( l ) = ( x°/360 ) × 2πr

Now ,

1 ) ( x°/360 ) × πr² = A

( x°/360 ) × π × 6² = 15π

x° = ( 15π × 360 )/( π × 36 )

x° = 150

2 ) length of the arc ( l ) = ( x/360 ) × 2πr

l = ( 150/360 ) × 2 × π × 6

l = 5π cm

hope this helps you