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QR²=8²+4²-2*8*4*1/2
QR²=64+16-32
QR²=48
QR=√(48)
QR=√(16*3)
QR=4√3
2)45/360 x Luas lingkaran = 40cm²
1/8xluas lingkaran = 40cm²
luas lingkaran = 40x8cm²
Luas lingkaran = 320 cm²