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= (p x l) + (1/2 πr²)
= (20 x 14) + (1/2 x 22/7 x 7 x 7)
= 280 + 77
= 357 cm² (c)
semoga membantu ya :)
Luas Persegi panjang = 20x14 = 280 cm
Jadi jawabannya 77+280 = 357cm (c)
18. Luas trapesium = x5 = 50
Luas persegi = 8x8 = 64
Jadi, jawabannya 50+64 = 114 cm (a)