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(2 × 1/2 × 5×12) + (20 ×12 + 20×13 + 20×5)
= (5×12) + 20 × (12+13+5)
= 60 + 20 × 30
= 60 + 600 = 660 cm2 (c.)
sisi mirig Δ=√12²+5²
=√144+25
=√169
=13 cm
Lp limas=2*Lalas + Kalas*tprisma
=2*1/2*5*12 + 12+5+13*20
=60 + 600
=660 cm² (c)