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ST2 = 30 × 30 - 18 × 18
ST2 = 900 - 324
ST2 = 576
ST = 24 cm
Keliling
= 20 + 30 + 20 + 24 + 18
= 50 + 44 + 18
= 94 + 18
= 112 cm (C)
26.)
L. Belah ketupat = d1 × d2 × 1/2
48 = 8 × (x + 1) × 1/2
48 = 4x + 4
4x = 44
x = 11 cm (C)
Maaf kalau lama.
Sekian dan terima kasih