vhetha
1a) r = 10,5 cm d = 21 cm k = 22/7 × 21 = 66 cm L = 22/7 × 10,5 × 10,5 = 346,5 cm² b) r = 21 cm d = 42 cm k = 22/7 × 42 = 132 cm L = 22/7 × 21 × 21 = 1386 cm² c) d = 50 cm r = 25 cm k = 3,14 × 50 = 157 cm L = 3,14 × 25 × 25 = 1962,5 cm² d) d = 63 r = 31,5 k = 3,14 × 63 = 197,82 cm L = 3,14 × 31,5 × 31,5 = 3115,67
2)L1 = ½ × 3,14 × 6 × 6 = 56,52 cm² L2 = ½ × (6+6) × 7 = 42 cm² Lttl = 56,52 + 42 = 98,52 cm² k1 = 3,14 × 12 = 37,68 cm s = √7² + 6² s = √49 + 36 s = √85 s = 9,2 kttl = 37,68 + (2 × 9,2) = 56,08 cm b) Ls = ½ × (40 + 28) × 32 = 1088 cm² L½lngkrn = ½ × 22/7 × 14 × 14 = 308 cm² L bnda = 1088 - 308 = 780 cm² K1 = ½ × 22/7 × 28 = 44 cm s = √32² + √{(40-28):2}² =√1024 + √ 36 = √1060 =32,6 cm kttl = 44 + (2 × 32,6) + 40 = 149,2 cm c)Ls = 20 × 14 = 280 cm² L1 = ½ × 22/7 × 7 × 7 = 77 cm L2 = ¼ × 22/7 × 7 × 7 = 38,5 Lbngun = 280 - 77 - 38,5 = 164,5 cm² ks = 2 × (20 + 14) = 2 × 34 = 68 cm k1 = ¼ × 22/7 × 14 = 11 cm k2 = ½ × 22/7 × 14 =22cm k bngun = 68 - 11 - 22 = 35 cm d) Ls = 14 × 14 = 196 cm² L lngkrn = 2 × ½ × 22/7 × 7 × 7 = 154 cm² L bngun = 196 - 154 = 42 cm² k ttl = 4 × 14 = 56 cm k1 = 2 × ½ × 22/7 × 14 = 44 cm k bngun = 56 - 44 = 12 cm
d = 21 cm
k = 22/7 × 21
= 66 cm
L = 22/7 × 10,5 × 10,5
= 346,5 cm²
b) r = 21 cm
d = 42 cm
k = 22/7 × 42
= 132 cm
L = 22/7 × 21 × 21
= 1386 cm²
c) d = 50 cm
r = 25 cm
k = 3,14 × 50
= 157 cm
L = 3,14 × 25 × 25
= 1962,5 cm²
d) d = 63
r = 31,5
k = 3,14 × 63
= 197,82 cm
L = 3,14 × 31,5 × 31,5
= 3115,67
2)L1 = ½ × 3,14 × 6 × 6
= 56,52 cm²
L2 = ½ × (6+6) × 7
= 42 cm²
Lttl = 56,52 + 42
= 98,52 cm²
k1 = 3,14 × 12
= 37,68 cm
s = √7² + 6²
s = √49 + 36
s = √85
s = 9,2
kttl = 37,68 + (2 × 9,2)
= 56,08 cm
b) Ls = ½ × (40 + 28) × 32
= 1088 cm²
L½lngkrn = ½ × 22/7 × 14 × 14
= 308 cm²
L bnda = 1088 - 308
= 780 cm²
K1 = ½ × 22/7 × 28
= 44 cm
s = √32² + √{(40-28):2}²
=√1024 + √ 36
= √1060
=32,6 cm
kttl = 44 + (2 × 32,6) + 40
= 149,2 cm
c)Ls = 20 × 14 = 280 cm²
L1 = ½ × 22/7 × 7 × 7
= 77 cm
L2 = ¼ × 22/7 × 7 × 7
= 38,5
Lbngun = 280 - 77 - 38,5
= 164,5 cm²
ks = 2 × (20 + 14)
= 2 × 34
= 68 cm
k1 = ¼ × 22/7 × 14
= 11 cm
k2 = ½ × 22/7 × 14
=22cm
k bngun = 68 - 11 - 22
= 35 cm
d) Ls = 14 × 14 = 196 cm²
L lngkrn = 2 × ½ × 22/7 × 7 × 7
= 154 cm²
L bngun = 196 - 154
= 42 cm²
k ttl = 4 × 14 = 56 cm
k1 = 2 × ½ × 22/7 × 14
= 44 cm
k bngun = 56 - 44
= 12 cm
3) L1 : L2
phi . r² : phi . r²
phi . 3² : phi . 12²
9phi : 144phi
9 : 144
1 : 16