z 10.
rownoległobok ma boki 20m i 15jedna druga m.oblicz obwod
z.12
obwod rombu jest rowny 25 i jedna druga cm.wiec bok ma dlugosc
z11
obwod rombu o bokach 3,5cm jest rowny
a.14 b.7 c.7,5 d.12
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1.
a=20m
b=15 i 1/2 m
O=?
O=2a+2b
O=2*20 + 2*15 i 1/2
O=40 +31
O=71 (m)
2.
O=25 i 1/2 cm
a=?
O=4a
25 i1/2 = 4a
4a=51/2/:4
a=51/2 * 1/4
a= 51/8
a= 6 i 3/8
3.
a=3,5 cm
O=?
O=4a
O=4* 3,5
O=14 (cm)
1.
a = 20m
b = 15 i 1/2 m
O = ?
O = 2a+2b
O = 2*20 + 2*15 i 1/2
O = 40 +31
O = 71 m
2.
O = 25 i 1/2 cm
a = ?
O = 4a
25 i1/2 = 4a
4a = 51/2/:4
a = 51/2 * 1/4
a = 51/8
a = 6 i 3/8
3.
a = 3,5 cm
O = ?
O = 4a
O = 4* 3,5
O = 14 (cm)