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r² = 25² - 20²
r² = 625 - 400
r² = 225
r = √225
r = 15
Lpermukaan = π r (r +s)
= 3,14 15 (15 + 25)
= 47,1 (40)
= 1884
s = 25cm
t = 20cm
lp= ...?
r =
r=
r=
r= 15cm
lp= πr²+πrs
lp= 3,14×15×15+3,14×15×25
lp= 706,5+1.117,5
lp= 1.884 cm²