Hitunglah1.luas lingkungan2.diameter lingkaran​

1. Lj = 72/360 × L

770 = 1/5 × L

L = 770 ÷ 1/5

L = 770 × 5

L = 3.850 cm2

2. L = πr'2

3.850 = 22/7 × r × r

r'2 = 3.850 ÷ 22/7

r'2 = 3.850 × 7/22

r'2 = 1.225

r = √ 1.225

r = 35 cm

d = 35 × 2

d = 70 cm

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