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600 = 4a × 3a ÷ 2
600 = 12a^2 ÷ 2
600×2 = 12a^2
1200 = 12a^2
a^2 = 1200 ÷ 12
a^2 = 100
a = √100
a = 10
D1 = 4.10 = 40 cm
D2= 3.10 = 30 cm
sisi miring
= √20^2 + 15^2
= √400 + 225
= √625
= 25 cm
keliling belah ketupat
= 4.25
= 100 cm^2