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19 December, 02:22

the base of a pyramid is equilateral triangle of side 8cm long. If the altitude of the pyramid is 15cm, find it's volume

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Answers (2)
  1. 19 December, 04:49
    0
    V = 80√3 cm³

    Step-by-step explanation:

    V = Ab*h/3

    Ab = l²√3/4 = 64√3/4 = 16√3 cm²

    V = 16√3cm²*15cm/3

    = 16√3cm²*5cm

    = 80√3 cm³
  2. 19 December, 04:49
    0
    138.56cm2

    Step-by-step explanation:

    B. a*hx1/3

    B. a=1/2*8*8sin60=27.71cm2

    1/3*27.71*15=138.56cm2
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