Jawaban:
Rumus keliling persegi
K = 4 × S
Rumus sisi persegi jika diketahui kelilingnya
S = K ÷ 4
keterangan:
K = keliling
S = sisi/ rusuk
1. tentukan keliling persegi
a. K = 4 × S
K = 4 × 9
= 36 cm
b.K = 4 × S
K = 4 × 17
= 68 cm
c. K = 4 × S
K = 4 × 35
= 140 cm
d. K = 4 × S
K = 4 × 23
= 92 cm
2. tentukan sisi persegi
a. S = K ÷ 4
S = 104 ÷ 4
= 26 cm
b.S = K ÷ 4
S = 132 ÷ 4
= 33 cm
c.S = K ÷ 4
S = 168 ÷ 4
= 42 cm
3. pada soal diketahui:
K = 116 cm
ditanya panjang sisi
jawab:
gunakan rumus:
S = K ÷ 4
S = 116 ÷ 4
= 29 cm
4. pada soal diketahui:
persegi 1
K = 136 cm
persegi 2
K = 192 cm
ditanya selisih panjang sisi kedua persegi
jawab:
gunakan rumus:
- sisi persegi 1
S = K ÷ 4
S = 136 ÷ 4
= 34 cm
- sisi persegi 2
S = K ÷ 4
S = 192 ÷ 4
= 48 cm
- mencari selisih persegi 1 dan 2
selisih = sisi persegi 2 - sisi persegi 1
= 48 - 34
= 14 cm
1. a. s = 9 cm
K = 4s
= 4.9 = 36 cm
b. s = 17 cm
K = 4s
= 4.17 = 68 cm
c. s = 35 cm
K = 4s
= 4.35 = 140 cm
d. s = 23 cm
K = 4s
= 4.23 = 92 cm
2. a. K = 104 cm
K = 4s
104 = 4s
s = 104/4 = 26 cm
b. K = 132 cm
K = 4s
132 = 4s
s = 132/4 = 33 cm
c. K = 168 cm
K = 4s
168 = 4s
s = 168/4 = 42 cm
3. K = 116 cm
K = 4s
116 = 4s
s = 116/4 = 29 cm
4. K₁ = 136 cm K₂ = 192 cm
K₁ = 4s₁ K₂ = 4s₂
136 = 4s₁ 192 = 4s₂
s₁ = 136/4 = 34 cm s₂ = 192/4 = 48 cm
s₂ - s₁ = 48 - 34 = 14 cm
