Bantu aq jawab soal matematika ini ya soalnya buat besok ! please

2. d = 3, maka r = 1,5

L = phi r^2
= 3,14 × 1,5 × 1,5
= 7,065 cm^2

3. K = 188,4
2 phi r = K
2 × 3,14 × r = 188,4
6,28 r = 188,4
r = 188,4 : 6,28
r = 30 cm

L = phi r^2
= 3,14 × 30 × 30
= 2.826 cm^2

4. L = 7850
phi r^2 = 7850
3,14 r^2 = 7850
r^2 = 7850 : 3,14
r^2 = 2500
r = 50 cm

K = 2 phi r
= 2 × 3,14 × 50
= 314 cm