Penjelasan dengan langkah-langkah:
1) t = 2 × Luas
alas
t = 2 × 165
22
t = 330
22
t = 15 cm
2) Keliling ABC = 30 cm
AB = 3 × 30
3+7+5
AB = 90
15
AB = 6 cm
BC = 7 × 30
3+7+5
BC = 210
15
BC = 14 cm
AC = 30 – 6 – 14
AC = 30 – 20
AC = 10 cm
3)
a. Luas = ½ × 12 × 6
Luas = 6 × 6
Luas = 36 cm²
b. Luas = ½ × 16 × 4
Luas = 8 × 4
Luas = 32 cm²
4)
a. Luas = ½ × AB × AC
Luas = ½ × 4 × 3
Luas = 2 × 3
Luas = 6 cm²
b. AD = AB × AC
BC
AD = 4 × 3
5
AD = 12
5
AD = 2,4 cm
5)
EF = √(5²+12²) = √(25 + 144) = √169
EF = 13 cm
Luas = DF × EG
2
Luas = 14 × 12
2
Luas = 168
2
Luas = 84 cm²
Keliling DEF = DE + EF + DF
Keliling DEF = 21 + 13 + 14
Keliling DEF = 48 cm
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