Question

145. HANYA BAGI YG MERASA BENAR2 JENIUS. JAWAB PAKAI CARA YG BAIK

Answer 1

4. luas sebenarnya (LS)= luas sketsa : (skala)^2

LS = 154 : (1/300)^2

= 154 : 1/90000

= 154 x 90000/1

= 13860000 cm^2

= 1386 m^2.

Luas lingkaran = LS = 1/4 x phi x d^2

1386 = 1/4 x 22/7 x d^2

1386 = 11/14 d^2

d^2 = 1386 : 11/14

d^2 = 1386 x 14/11 = 1764

d =

d = 42 cm.

5.

Peta lama :

JS = JP : S

JS = 8 : 1/1125000

JS = 8 x 1125000

JS = 9 000 000 cm

Peta baru :

JP = S x JS

JP = 1/1500000 x 9000000

JP = 6 cm