100 Practical Ways to Improve Customer Experience: Achieve End-to-End Customer Engagement in a

100 Practical Ways to Improve Customer Experience: Achieve End-to-End Customer Engagement in a

Matematika 2. Perhatikan gambar berikut!
Tentukan keliling dan luas bangun di atas!

yang bener jawabannya di follow + jawaban terbaik​

2. Perhatikan gambar berikut!
Tentukan keliling dan luas bangun di atas!

yang bener jawabannya di follow + jawaban terbaik​

Penjelasan dengan langkah-langkah:

sisi alas = 9 + 18 = 27 cm

tingginya

= √15² - 9²

= √225 - 81

= √144

= 12 cm

A. keliling

K = s1 + s2 + s3 + s5

K = 18 + 15 + 27 + 12

K = 33 + 39

K = 72 cm

B. Luas

L = 1/2 × (jlh sisi sejajar) × t

L = 1/2 × (27 + 18) × 12

L = 1/2 × 45 × 12

L = 45 × 6

L = 270 cm²

Diketahui:

  • KO = 9 cm
  • KN = 15 cm
  • MN = LO = 18 cm
  • KL = 9 + 18 = 27 cm

[tex] \\ [/tex]

Ditanyakan:

  • K = ... cm?
  • L = ... cm²?

[tex] \\ [/tex]

Penyelesaian:

  • Tentukan panjang sisi NO atau ML

[tex]\tt NO = \sqrt{{KN}^{2} - {KO}^{2}}[/tex]

[tex]\tt NO = \sqrt{ {15}^{2} - {9}^{2} } [/tex]

[tex]\tt NO = \sqrt{225 - 81} [/tex]

[tex]\tt NO = \sqrt{144} [/tex]

[tex]\tt NO =12 \: cm[/tex]

  • Hitung keliling bangun

K = Jumlah semua sisi

K = KL + ML + MN + KN

K = 27 + 12 + 18 + 15

K = 39 + 33

K = 72 cm

  • Hitung luas bangun

L = ½ × (jumlah sisi sejajar) × t

L = ½ × (MN + KL) × NO

L = ½ × (18 + 27) × 12

L = 6 × 45

L = 270 cm²

[tex] \\ [/tex]

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