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=1/3.La.t
=1/3.90.18
=30 x 18
=540 cm^3
= 1/3 x (1/2 x 10 x 18) x 18
= 90 x 6 = 540 cm²
5) Lp balok = (2 x 2) + (4x2x3) = 4 + 24 = 28
tinggi permukaan segitiga = √12² + 1² =√145. Lp = 4 x 1/2 x 2 x √145 = 4√145.
Lp limas = 28 + 4√145 cm²