Jawaban:

Nomor a

Keliling ( K )

K = 308

.

Mencari Diameter ( d )

K = π × d

308 = 22/7 × d

d = 308 ÷ 22/7

d = 308 × 7/22

d = 2.156/22

d = 98 cm

.

Mencari jari-jari ( r )

r = d ÷ 2

r = 98 ÷ 2

r = 49 cm

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Nomor b

Diameter ( d )

d = 24 cm

.

Mencari keliling ( K )

K = π × d

K = 3,14 × 24

K = 75,36 cm

.

Mencari jari-jari ( r )

r = d ÷ 2

r = 24 ÷ 2

r = 12 cm

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Nomor c

Jari-jari ( r )

r = 15 cm

.

Mencari keliling ( K )

K = 2 × π × r

K = 2 × 3,14 × 15

K = 6,28 × 15

K = 94,2 cm

.

Mencari Diameter ( d )

d = 2 × r

d = 2 × 15

d = 30 cm

Semoga dapat dipahami

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