Question

Tentukan ukuran persegi panjang berikut!
1. P = 27 m
L = 8 dm
Keliling = ..... dm
Luas = ...... dm2

2. P = 5 m
L = ........ dm
Keliling = ...... cm
Luas = 250 cm2

3. P = 360 m
L = 90 dam
Keliling = ..... dam
Luas .... dam2

4. P = ..... m
L = 600 m
Keliling = ..... m
Luas = 2 ha

5. P = 2 km
L = .... dam
Keliling = 1200 dam
Luas = ..... ha

Bantu jawaab yaaa!pls~
#thxbefore.

Answer 1

1 . k = 2 x (p+l )
     k = 2 x ( 270dm+8dm)
     k = 2 x 268
     k = 556 dm
     l = pxl
     l = 270 x 8
     l =2160 dm2
2 . lebar = luas : p
     lebar = 2,5 dm : 50 dm
     lebar = 0,05 dm
     keliling = 2. (0,05 +50 )
     keliling = 100,1 dm
3 .keliling = 2 . ( 36 + 90 )
   keliling = 2 . 126
   keliling = 252 dam
   luas = 36 x 90
   luas = 3240 dam2
4. p = 20.000 : 600
   p = 33,3 m
   k = 2 x ( 33,3 + 600)
   k = 2 x 633,3
   k = 1266,6 m
5.lebar = 1200 dam - (200x2) : 2
  lebar = 1200 - 400 : 2
  lebar =  800 :2
  lebar = 400 dam
  luas =  400 dam x 200 dam
  luas = 80.000 dam2
  luas = 800ha