___________________________________________
L Persegi = S × S
L Persegi = 28 × 28
L Persegi = 784 cm²
L Segitiga = ½ × A × T
L Segitiga = ½ × 12 × 28
L Segitiga = ½ × 336
L Segitiga = 168 cm²
L ½ Lingkaran = ½ × π × r²
L ½ Lingkaran = ½ × 22/7 × 14²
L ½ Lingkaran = ½ × 22/7 × 196
L ½ Lingkaran = ½ × 616
L ½ Lingkaran = 308 cm²
L Gabungan
= L Persegi + L Segitiga + L ½ Lingkaran
= 784 + 168 + 308
= 784 + 476
= 1.260 cm²
Luas total
= luas persegi + luas ½lingkaran + luas segitiga
= (s × s) + (½πr²) + (½ × a × t)
= (28 × 28) + (11/7 × 14 × 14) + (½ × 12 × 28)
= 784 + (11 × 2 × 14) + (12 × 14)
= 784 + 308 + 168
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SOAL 1
___________________________________________
L Persegi = S × S
L Persegi = 28 × 28
L Persegi = 784 cm²
___________________________________________
L Segitiga = ½ × A × T
L Segitiga = ½ × 12 × 28
L Segitiga = ½ × 336
L Segitiga = 168 cm²
___________________________________________
L ½ Lingkaran = ½ × π × r²
L ½ Lingkaran = ½ × 22/7 × 14²
L ½ Lingkaran = ½ × 22/7 × 196
L ½ Lingkaran = ½ × 616
L ½ Lingkaran = 308 cm²
___________________________________________
L Gabungan
= L Persegi + L Segitiga + L ½ Lingkaran
= 784 + 168 + 308
= 784 + 476
= 1.260 cm²
___________________________________________
Luas total
= luas persegi + luas ½lingkaran + luas segitiga
= (s × s) + (½πr²) + (½ × a × t)
= (28 × 28) + (11/7 × 14 × 14) + (½ × 12 × 28)
= 784 + (11 × 2 × 14) + (12 × 14)
= 784 + 308 + 168
= 1.260 cm²