p.grs.pelukis kerucut (s) = √(t²+r²) = √(4²+3) = √(16+9) = √25 = 5 cm maka, Lp tabung tanpa tutup + Lp kerucut = phi x r x (r+2t) + phi x r x (r+s) = 3,14 x 3 x (3+2x10) + 3,14 x 3 x (3+5) = 9,42 x (3+20) + 9,42 x 8 = 9,42 x 23 + 9,42 x 8 = 216,66 + 75,36 = 292,02 cm²
p.grs.pelukis kerucut (s)
= √(t²+r²)
= √(4²+3)
= √(16+9)
= √25
= 5 cm
maka,
Lp tabung tanpa tutup + Lp kerucut
= phi x r x (r+2t) + phi x r x (r+s)
= 3,14 x 3 x (3+2x10) + 3,14 x 3 x (3+5)
= 9,42 x (3+20) + 9,42 x 8
= 9,42 x 23 + 9,42 x 8
= 216,66 + 75,36
= 292,02 cm²