Tolong dijawab plisssss​

Jawaban:

1. Lp = 2 x π x r x ( r + t )

Lp = 2 x 22/7 x 7 x ( 7 + 25 )

Lp = 44 x 32

Lp = 1.408

2. Lp = 2 x π x r x ( r + t )

Lp = 2 x 22/7 x 7 x ( 7 + 20 )

Lp = 44 x 27

Lp = 1.188

3. Lp = 2 x π x r x ( r + t )

1.570 = 2 x 3,14 x 10 x ( 10 + t )

1.570 = 62,8 x ( 10 + t )

1.570 = 62,8t + 628

62,8t = 1.570 – 628

62,8t = 942

t = 942 : 62,8

t = 15

4. Lp tanpa tutup = π x r x ( r + 2t )

Lp tanpa tutup = 3,14 x 4 x ( 4 + 2.9)

Lp tanpa tutup = 3,14 x 4 x 22

Lp tanpa tutup = 276,32 cm²