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if the bases are b1 and b2, then: area = ½ × (b1 + b2) × h → 2 × area ÷ h = b1 + b2 → b2 = 2 × area ÷ h - b1 = 2 × 156.6 m² ÷ 18 m - 6 m = 11.4 m
t1 s1 b1 t1 s1 b2 t1 s2 b1 t1 s2 b2 t2 s1 b1 t2 s1 b2 t2 s2 b1 t2 s2 b2 t3 s1 b1 t3 s1 b2 t3 s2 b1 t3 s2 b2 TOTAL 12 combinations OR 2(3 x 2) = 12
A=1/2(b1+b2)h A=1/2(7+12)5 A=1/2(19)5 A=9.5x5 A=47.5
In Excel, B1 is a cell address where column B and row 1 meet.
V= 1/2 (b1+b2) x h x L Volume = (area of the cross section) x (the length L) V = [ 1/2 (base1 +base 2) x height ] x length