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l lingkaran = phi x rx r
154= 22/7 x r x r
154x7 = 22xrxr
1078 = 22 rkuadrat
rkuadrat = 49
r= 7
L.permukaan = 2xphixr ( r+t)
t= ( L/2 phi r ) - r
t = (2068/2x22/7x7)- 7
= 47-7
= 40
154=22/7 × r²
154×7=22×r²
r²=154×7/22
r²=49
r=√49=7
Luas permukaan= 2πr(r+t)
2068=2×22/7×7(7+t)
2068×7=2×22×7(7+t)
14476=308(7+t)
7+t=14476/308
7+t=47
t=47-7=40