180 Days of Self-Care for Busy Educators (A 36-Week Plan of Low-Cost Self-Care for Teachers and

180 Days of Self-Care for Busy Educators (A 36-Week Plan of Low-Cost Self-Care for Teachers and

Matematika 5. hitunglah keliling bangun berikut​

5. hitunglah keliling bangun berikut​

Jawab:

Penjelasan dengan langkah-langkah:

b.

KO dalam =2π2πr

KO dalam =2x22/7x7

KO dalam =44cm

KO luar =2xπxr

KO luar =2x22/7x14

KO luar =888cm

KO luar - KO dalam: = KO irisan

KO irisan =88cm-44cm=44cm:2=2222cm

c.K1/4O=2πrx1/

KO=2x3,14x10x(1/4)

KKO=13,2cm

Lingkaran B

K.½L.besar

= ½ × π × d

= ½ × 22/7 × (4 × 7)

= ½ × 22/7 × 28

= 11 × 4

= 44 cm

.

K.½L.kecil

= ½ × π × d

= ½ × 22/7 × (2 × 7)

= ½ × 22/7 × 14

= 11 × 2

= 22 cm

.

K.Bangun

= K.bsr + K.kcl + 7 cm + 7cm

= 44 cm + 22 cm + 14 cm

= 80 cm

[tex] \\ \\ [/tex]

Lingkaran C

K.¼L.

= ¼ × π × d

= ¼ × 3,14 × (2 × 10)

= 1/4 × 3,14 × 20

= 3,14 × 5

= 15,7 cm

.

K.Bangun

= K.¼L + 10 cm + 10 cm

= 15,7 cm + 20 cm

= 35,7 cm

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