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Verified answer
25.Luas = 1/2 (alas x tinggi)
Luas = 1/2 ( 8 x 6)
Luas = 1/2 (48)
Luas = 24 cm²
Jawaban D
25.
¶ Tinggi segitiga = 26 - 12 = 14 cm
¶ Alas segitiga = 20 - 8 = 12 cm
Maka luas segitiga:
L = 1/2 (Alas x tinggi)
L = 1/2 ( 12 x 14)
L = 84 cm²
¶ P persegi panjang = 20 cm
¶ Lebar = 12 cm
Luas persegi panjang :
L = panjang x lebar
L = 20 x 12
L = 240 cm²
Maka luas bangun datar :
= Luas segitiga + luas persegi panjang
= 84 + 240
= 324 cm²
Jawaban B.
28. Luas permukaan = 6×s^2 = 6× 12^2= 6×144= 864 cm^2 (A)
29. V = luas alas× tinggi = phi×r^2×t
= 22/7×7×7×20
= 3.080 cm^3 (C)
30. V = luas alas × tinggi
= 1/2×alas×tinggi× tinggi prisma
= 1/2×20×15×22
= 3.300 cm^3 (D)