Jawab dengan benartidak ngasaljawab semua
Penjelasan dengan langkah-langkah:
8)
= 2 × π × r
= 2 × 22/7 × 14
= 2 × 22 × 2
= 88 Cm (B)
9)
= ½ × 2 × π × r
= ½ × 2 × 22/7 × 21
= ½ × 2 × 22 × 3
= ½ × 132
= 66 Cm (B)
10)
= π × r × r
= 3,14 × 10 × 10
= 314 Cm² (C)
11)
K = π × d
132 = 22/7 × d
d = 132 × 7/22
d = 42 Cm (A)
12)
L = π × r × r
616 = 22/7 × r²
r² = 616 × 7/22
r² = 196
r = 14 Cm (D)
13)
= θ/360 × π × r × r
= 72/360 × 22/7 × 20 × 20
= 1/5 × 22/7 × 400
= 1/5 × 1.257,14
= 251,4 Cm² (A)
14)
= ¾ × 2 × π × r
= ¾ × 2 × 22/7 × 14
= ¾ × 2 × 22 × 2
= ¾ × 88
= 66 Cm (–)
15)
= ½ × π × r × r
= ½ × 22/7 × 7 × 7
= 11 × 7
= 77 Cm (C)
Cara Jawaban =
8.)
K = phi x 2 x r.
K = 22/7 x 2 x 14.
K = 22/7 x 28 cm.
K = 88 cm ( B. )
9.)
K = phi x 2 x r x 1/2.
K = phi x r .
K = 22/7 x 21.
K = 66 cm ( B. )
10.)
L = phi x r x r.
L = 3,14 x 10 x 10 cm.
L = 3,14 x 100 cm.
L = 314 cm^2. ( C. )
11.)
D = Keliling ÷ phi.
D = 132 ÷ 22/7.
D = 132 x 7/22.
D = 42 cm ( A. )
12.)
r = √L ÷ Phi.
r = √616 ÷ 22/7.
r = √616 x 7/22.
r = √196 = 14 ( D. )
13.)
L . Juring.
72/360 = 1/5.
1/5 x L. Lingkaran.
1/5 x 22/7 x 20 x 20.
22/7 x 20 x 4.
22/7 x 80 cm.
= 251,4 cm^2 ( A. )
14.)
K = 3/4 x phi x 2 x r + 2 x r.
K = 3/4 x 22/7 x 2 x 14 + 2 x 14 cm.
K = 3/4 x 22/7 x 28 cm + 28 cm.
K = 94 cm ( C. )
15.)
L = 1/2 x phi x r x r.
L = 1/2 x 22/7 x 7 x 7.
L = 1/2 x 22/7 x 14 cm.
L = 77 cm ( C.)
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