tolong dong jawabannya
Penjelasan dengan langkah-langkah:
a) Luas alas :
= ½ × a × t
= ½ × 9 × 12
= ½ × 108
= 54 Cm²
b)
Sisi Miring = √(12² + 9²) = √225 = 15 Cm
Keliling :
= a + b + c
= 9 + 12 + 15
= 36 Cm
c)
= (2 × la) + (ka × tp)
= (2 × 54) + (36 × 20)
= 108 + 720
= 828 Cm²
d)
= la × t
= 54 × 20
= 1.080 Cm³
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