Question

tolonglahhh mau dikumpulkan niii​

Answer 1

Verified answer

Luas = 90

p = 2,5 lebar

Luas = pj x lebar

90 = 2,5 lebar x lebar

90 = 2,5 lebar²

lebar² = 90/2,5

lebar² = 36

lebar = √36

lebar = 6

maka panjang = 2,5 lebar

= 2,5 (6)

= 15

a) Panjang = 15 cm, lebar = 6 cm

b) keliling = 2p + 2l

= 2(15) + 2(6)

= 30 + 12

= 42 cm

Answer 2

p x l = Luas persegi panjang

[tex]2 \frac{1}{2} l \times l = 90 \\2,5l \times l = 90 \\ 2,5 {l}^{2} = 90 \\ {l}^{2} = \frac{90}{2,5} \\ {l}^{2} = 36 \\ l = \sqrt{36} \\ l ebar= 6 \: cm\\ \\ panjang = 2,5l \\ 2,5(6) = 15 \: cm \\ \\ b).keliling \\ 2(p + l) \\ 2(15 + 6) \\ 2(21) \\ 42 \: cm[/tex]