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1. a) kel : 30 + 30 + 30 = 90 cm
b) alas² : 10² - 8² = 100 - 64 = 36
alas : √36 = 6 cm
kel : 6 + 10 + 8 = 24 cm
3. 84 = 12 x t : 2
84 x 2 : 12 = t
14 cm = t
5. L lapangan = 25 x 20 = 500²
L 1 segitiga = 8 x 6 : 2 = 24 cm²
L 2 segitiga = 24 x 2 = 48 cm²
luas tanaman rumput = 500 - 48 = 452 cm²
maap kalo salah ●—●