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Diketahui :
- d = 10 cm > r = 5 cm
- t = 12 cm
Ditanya :
- LP :...?
S²= r²+t²
S²= 5²+12²
S²= 25+144
S= √169
S= 13 cm
LP = πr (r+s)
LP = 3,14 x 5 (5+13)
LP = 15,7 (18)
LP = 282,6 cm²
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