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untuk tinggi segitiga alas bisa dicari dengan rumus phytagoras.
= +
= +
- =
=
c = 12
Maka :
Volume = luas alas x tinggi
Volume = 1/2 x 10 x 12 x 8
Volume = 480 cm3
V = 12×10/2 ×8
= 60 × 8 = 480 cm³