tolong bantu ya no 1-10

keliling persegi = 2p + 2l

1) 2.7cm + 2.4cm = 14 + 8 = 22 cm
2) 2.10cm + 2.1cm = 20 + 2 = 22 cm
3) 2.25m + 2.13m = 50 + 26 = 76 m
4) 2.28m + 2.14m = 56 + 28 = 84 m
5) 2.15dm + 2.8dm = 30 + 16 = 46 dm
6) 2.21cm + 2.10cm = 42 + 20 = 62 cm
7) 2.23m + 2.12m = 46 + 24 = 70 m
8
9
10) 2.40m + 2.65m = 80 + 130 = 210 m

Nb : tanda (.) artinya kali (×)

matematika
kelas:3 sd
bab:keliling bangun datar
rumus K persegi panjang:2×(p+l)
1.2×(7+4)=2×11
=22 cm
2.2×(10+1)=2×11
=22 cm
3.2×(25+13)=2×38
=76 m
4.2×(28+14)=2×47
=94 m
5.2×(15+8)=2×23
=46 dm
6.2×(21+10)=2×31
=62 m
7.2×(23+12)=2×35
=70 m
8.gambarnya kepotong.
9.------------- " -----------------
10.2×(65+40)=2×105
=210 m

smg benar >_<