Jawaban:
170=42+l+l+keliling setengah lingakran
170-42
128=l+l+1/2 π diamet
128=l+l+1/2×22/7×42
128=l+l+66
128-66=l+l
62=l+l
L=31
buat setengah lingkaran
π r²×1/2
-1/2×22/7×21×21
=693
p×l
=42×31
=1302
1302+693
=1995
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Verified answer
Jawaban:
170=42+l+l+keliling setengah lingakran
170-42
128=l+l+1/2 π diamet
128=l+l+1/2×22/7×42
128=l+l+66
128-66=l+l
62=l+l
L=31
buat setengah lingkaran
π r²×1/2
-1/2×22/7×21×21
=693
p×l
=42×31
=1302
1302+693
=1995