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39. Cari dulu tinggi trapesiumnya= √13^2-5^2
=√169-25
=√144
=12 cm
*5 didapat dari 50-40/2.
(=) Luas permukaan= 2×luas alas+ (keliling alas×tinggi)
=2× ((a+b)×t/2) + ((2*13+40+50)×25)
=2× ((40+50)×12/2)+2.900
=2×540+2.900
=3.980^2 (B)
40. Tinggi kubus+limas=30 cm.
Karena kubus sudah diketahui panjang setiap rusuknya 15 cm. Maka, tinggi limas= 30-15=15 cm.
Volume bangun ruang 1(limas)= 1/3 ×luas alas× tinggi
= 1/3× (s*s) ×15
=1/3× (15*15) ×15
=1/3× 3.375
=1.125 cm^3
Volume bangun ruang 2(kubus)=s^3
=15×15×15
=3.375 cm^3
Volume keseluruhan= 1.125+3.375
=4.500 cm^3 (D)
Semoga membantu dan mudah dipahami ^^
=√13²-5²
=√169-25
=√144
=12
Lp = 2 × Luas alas + keliling alas × tinggi prisma
= 2 × (½×(40+50)×12) + (13+40+13+50) × 25
= 2 × 540 + 116 × 25
= 1080 + 2900
= 3980