19. V = πr²t
V = (42/2)²π.50
V = 21².50.22/7
V = 69300 cm³
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19. V = πr²t
V = (42/2)²π.50
V = 21².50.22/7
V = 69300 cm³
Rumus : 1/2 x d1 x d2
d1 = 20+5 = 25
d2= triple phytagoras (disitu sudah diketahui tinggi 5cm dan sisi miring 13. Jadi panjang sisi bawahnya itu 12cm)
= 12x 2 = 24
1/2 x 25 x 24 = 300cm