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Persegi panjang
L = p × l
L = 12 × 8
L = 96 cm²
Segitiga
a² = s² - t²
a² = 10² - 8²
a² = 100 - 64
a² = 36
a = √36
a= 6
L = a ×t ÷ 2
L= 6 × 8 ÷ 2
L= 48 ÷ 2
L= 24 cm²
Luas Persegi Panjang + Luas Segitiga
96 cm² + 24 cm² = 120 cm²
alas segitiga= 9 (pakai phitagoras)
15²=12²+a²
a²=225-144
a²=81
a=9 cm
Lsegitiga=0.5 * a * t
L=0.5*9*12
L=54 cm²
alas trapesium=20-9=11 cm
Ltrapesium= 0.5*(a+b)*t
L=0.5*(11+20)*12
L=186 cm²
Ltotal=Lsegitiga+Ltrapesium
Ltotal=54 cm²+186 cm²
Ltotal=240 cm²
Gambar 5
Lpersegi panjang=96 cm²
Lsegitiga=24 cm²
Ltotal=120 cm²