Bantu jawab ya ini …..

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Bantu jawab ya ini .....

Bantu jawab ya ini …..

Lp = 2 × phi × r × ( r + t )

Lp = 2 × 3,14 × 20cm × ( 20cm + 12cm )

Lp = 2 × 3,14 × 20cm × 32cm

Lp = 2 × 3,14 × 640cm

Lp = 2 × 2009,6cm

Lp = 4019,2cm²

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d = 40 cm

r = d : 2 = 20 cm

t = 12 cm

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Lp = 2 × π × r × (r + t)

= 2 × 3,14 × 20 × (20 + 12)

= 125,6 × 32

= 4.019,2 cm² ☑