Berapa volume bangun-nya?

Bab Bangun Ruang
Matematika SMP Kelas VIII

limas alas persegi panjang
diagonal alas = √(p² + l²)
diagonal alas = √(16² + 12²)
diagonal alas = √(256 + 144)
diagonal alas = 20 cm

tlimas = √(rusuk tegak² - (1/2 x diagonal alas)²)
tlimas = √(26² - (1/2 x 20)²)
tlimas = √(676 - 100)
tlimas = 24 cm

volume = 1/3 x p x l x tlimas
volume = 1/3 x 16 x 12 x 24
volume = 1.536 cm³