Question

dimohon bantuannya kak​

Answer 1

Jawaban:

c. 30 cm

semangat ya belajar nya!! makin naik kelas soal nya makin susah!!!

Penjelasan :

Diketahui :

- s¹ = ( p + 1 ) cm

- s² = 5 cm

- s³ = ( 2p - 9 ) cm

- L = 39 cm²

Ditanyakan :

- Keliling nya

Dijawab :

L = ½ × a × t

30 cm² = ½ × ( p + 1 ) × 5 cm

30 cm² = 2,5 cm × ( p + 1 )

p + 1 = 30 cm² ÷ 2,5 cm

p + 1 = 12 cm

p = 12 cm - 1

p = 11 cm

Maka...

s¹ = p + 1

11 cm + 1

12 cm

s³ = 2p - 9

11.2 cm - 9

22 cm - 9

13 cm

Jadi...

K = s¹ + s² + s³

K = 12 cm + 5 cm + 13 cm

K = 30 cm