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l.s.k = 3,14 × 9 ( 9+13 ) << pke tripel phytagoras
l.s.k = 28,26 × 22
l.s.k = 621,72
dit: L selimut?
jawab: L. selimut = π.r.s
karna nilai s nya belum diket jd cari dlu s nya dgn rumus
s = √r²+t²
= √9²+12²
= √81+144
= √225
= 15 cm
L.selimut = π.r.s = π.9.15 = 135π cm² (b)