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d = 8 cm
d = a√2
a√2 = 8 |:√2
a = 8/√2
a = 8√2/2
a = 4√2
b = 5 cm
H²+(1/2d)² = b²
H²+4² = 5²
H² = 25-16
H² = 9
H = √9
H = 3 cm
V = 1/3*a²*H
V = 1/3*(4√2)²*3
V = 16*2
V = 32 cm³
a²=25-16
a=3
h=3
v=1/3Pp*h
a=d/√2
a=8/√3*√2/√2
a=4√2
Pp=a²
Pp=(4√2)²=32
v=1/3*32*3
v=32cm³