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A. Luas Bangun = Luas I + Luas II + Luas III
= 80 + 20 + 39,25
= 100 + 39,25
= 139,25 Cm²
Luas I ( Persegi Panjang ) = P × L
= 10 × ( 4 × 2 )
= 10 × 8
= 80 Cm²
Luas II ( Persegi Panjang ) = P × L
= 5 × 4
= 20 Cm²
Luas III ( 1/2 Lingkaran ) = × × r²
= × 3,14 × ( 10 ÷ 2 )²
= × 3,14 × 5²
= × 3,14 × 25
= × 78,5
= 39,25 Cm²
A. Keliling Bangun = Keliling I + Keliling II + Keliling III
= 36 + 18 + 15,7
= 54 + 15,7
= 69,7 Cm
Keliling I = 2 × ( P + L )
= 2 × ( 10 + ( 4 × 2 ))
= 2 × ( 10 + 8 )
= 2 × 18
= 36 Cm
Keliling II = 2 × ( P + L )
= 2 × ( 5 + 4 )
= 2 × 9
= 18 Cm
Keliling III = × × D
= × 3,14 × 10
= × 31,4
= 15,7 Cm
B. Luas Bangun = Luas I + Luas II
= 40 + 147
= 187 Cm²
Luas I ( Persegi Panjang ) = P × L
= 8 × 5
= 40 Cm²
Luas II ( Trapesium ) = × ( Jumlah Sisi Sejajar ) × Tinggi
= × ( 5 + ( 5 + 10 + 10 ) ) × 9,8
= × ( 5 + 25 ) × 9,8
= × 30 × 9,8
= 15 × 9,8
= 147 Cm²
Tinggi Trapesium = Tinggi Segitiga
Rumus Phytagoras
t² = Sisi Miring² - Alas²
= 14² - 10²
= 196 - 100
= 96
t = √ 96
= 9,8 Cm
B. Keliling Bangun = 5 + 5 + 14 +14 +10 + 10 + 8 + 8
= 10 + 28 + 20 + 16
= 38 + 36
= 74 Cm