Question

27,28 mohon bantuannya, makasih

Answer 1

Verified answer

Pelajaran    :Matematika
Kelas          :5
Bab             :3
Nama Bab  :Luas Bangun Datar Sederhana
Kode mapel:2
Kode           :5.2.3

Jawab:

 27)
s=√(48cm/2)+(20cm/2)²
s=√(24cm)²+(10cm)²
s=√576cm²+100cm²
s=√676cm²
s=26cm

DC=s
     =26cm

AB=26cm+(20cm/2)
     =26cm+10cm
     =36cm
 
CB=48cm/2
     =24cm

K=CB+AB+DC+3s
   =24cm+36cm+26cm+3(26cm)
   =86cm+78cm
   =164cm


28)
L arsir=L seg kiri-L seg tengah+L seg kanan-L seg tengah
          =L seg kiri+L seg kanan-2L seg tengah
          =(12cm×(13cm+6cm))/2+(12cm×(4cm+13cm+6cm))/2-2(12cm×6cm)/2
          =(12cm×19cm)/2+(12cm×23cm)/2-(72cm²)
          =114cm²+138cm²-72cm²
          =180cm²