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20 × 16 = 320
luas 2 = p × l
20×16= 320
luas 3 (segitiga kanan kiri digabungkan) = panjang × tinggi
panjang = a²= c²-b²
a= 18²-16²=324-256= 64
a=√64 = 8
p × l= 16× 8 = 128
luas gabungan = 320+320+128=768
keliling=16+24+8+18+16+24+8+18=132
luas 1 = p×l
25×14= 350
luas 2 = ½×π×r²
½×22/7×7²=77
luas gabungan 350+77=427
keliling setengah lingkaran= ½×π×d
½×22/7×14= 22
keliling gabungan 25+22+25+14=86