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Verified answer
1 ) 3 dm = 30 cmJari jari = diameter ÷ 2
= 30 cm ÷ 2
= 15 cm
2 ) 154 cm × 7/22
= 49
Jari jari = Diameter ÷ 2
= 49 ÷ 2
= 24,5 cm
jari jari = 30 : 2 = 15 cm \\ \\ 2.)keliling \: = 2 \times \pi \: r \\ 154 = 2 \times \frac{22}{7} \times \: r \\ 154 = \frac{44}{7} \times r \\ r = 154 : \frac{44}{7} \\ =154 \times \frac{7}{44} = 24,5
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