yusrodianto
A.3,14×20=62,8 cm B.14+25=39+25=64+(22/7×7×7)=64+154=218 cm
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febrianaeviona
8.a keliling 1/4 lingkaran 1/4 x phi x r =1/4 x 3,14 x 10 cm = 1/4 x 31,4 = 7,85 cm b. keliling persegi panjang + keliling 1/2 lingkaran 2.(p+l) + 1/2 x phi x r = 2.(25+14) + 1/2 . 22/7 . 7 =2.39 + 11/7 x 7 = 78 + 11 = 89
B.14+25=39+25=64+(22/7×7×7)=64+154=218 cm
1/4 x phi x r
=1/4 x 3,14 x 10 cm
= 1/4 x 31,4
= 7,85 cm
b. keliling persegi panjang + keliling 1/2 lingkaran
2.(p+l) + 1/2 x phi x r
= 2.(25+14) + 1/2 . 22/7 . 7
=2.39 + 11/7 x 7
= 78 + 11
= 89