hasil dari 8×(-31) adalahA.284b.248c.-248d.-284pakai jalan​

Penjelasan dengan langkah-langkah:

nomor.8.c.27 2/35

sudah

K = 2 × pi × r

132 cm = 2 × 22/7 × r

66 cm = 22/7 × r

r = 66 cm × 7/22

r = 21

.

L = pi × r²

L = 22/7 × 21²

L = 22/7 × 441

L = 1.386 cm²

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Penjelasan dengan langkah-langkah:

_____________________________

Gunakan rumus berikut untuk menjabarkan

[tex]\boxed{(a + b)^2 = a^2 + 2ab + b^2}[/tex]

_____________________________

[tex]\tt (8 + \sqrt{5})^2[/tex]

[tex]\tt = 8^2 + 2 \times 8\sqrt{5} + \sqrt{5}^2[/tex]

[tex]\tt = 64 + 16\sqrt{5} + 5[/tex]

[tex]\tt = 69 + 16\sqrt{5}[/tex]

_____________________________

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Penjelasan dengan langkah-langkah:

= 5 2/5 + 4 1/6

= 27/5 + 25/6

= 162/30 + 125/30

= (162 + 125)/30

= 287/30

= 9 17/30