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=1/4×22/7×10²
=78,5
L Δ = 1/2at
=1/2×10×10
=50
L daerah yg diarsir = 78,5 - 50= 28,5
7) keliling lngkaran = d
=22/7×84cm
=264cm
banyak putaran = 264 m ÷ 264 cm
=26400 ÷ 264
= 100
9)∠ABC=1/2AOC
(2p-8)°=1/2(3p+19)°
2(2p-8)=3p+19
4p-16=3p+19
4p-3p=19+16
p=35
∠ABC= 2p-8 = 2(35)-8 = 70-8=62°