Jawaban:
A. Panjang = 10 cm
Lebar = 9 cm
Keliling = 38 cm
Luas = 90 cm²
B. Panjang = 12 cm
Lebar = 16 cm
Keliling = 56 cm
Luas = 192 cm²
C. Panjang = 8 dm
Lebar = 15 dm
Keliling = 46 dm
Luas = 120 dm²
Penjelasan dengan langkah-langkah:
Rumus Persegi Panjang:
Luas = panjang X lebar atau p X l
Keliling = 2 X (p + l)
Panjang = Keliling - (lebar X 2) / 2
Lebar = keliling - (panjang X 2) / 2
A. Keliling = 2 X (p + l)
= 2 X (10 + 9)
= 2 X 19
= 38 cm
Luas = p X l
= 10 X 9
= 90 cm²
B. Lebar = keliling - (panjang X 2) / 2
= 56 - (12 X 2) / 2
= 56 - 24 / 2
= 32 / 2
= 16 cm
= 12 X 16
= 192 cm²
C. Panjang = keliling - (lebar X 2) / 2
= 46 - (15 X 2) / 2
= 46 - 30 / 2
= 16 / 2
= 8 dm
= 8 X 15
= 120 dm²
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Jawaban:
A. Panjang = 10 cm
Lebar = 9 cm
Keliling = 38 cm
Luas = 90 cm²
B. Panjang = 12 cm
Lebar = 16 cm
Keliling = 56 cm
Luas = 192 cm²
C. Panjang = 8 dm
Lebar = 15 dm
Keliling = 46 dm
Luas = 120 dm²
Penjelasan dengan langkah-langkah:
Rumus Persegi Panjang:
Luas = panjang X lebar atau p X l
Keliling = 2 X (p + l)
Panjang = Keliling - (lebar X 2) / 2
Lebar = keliling - (panjang X 2) / 2
A. Keliling = 2 X (p + l)
= 2 X (10 + 9)
= 2 X 19
= 38 cm
Luas = p X l
= 10 X 9
= 90 cm²
B. Lebar = keliling - (panjang X 2) / 2
= 56 - (12 X 2) / 2
= 56 - 24 / 2
= 32 / 2
= 16 cm
Luas = p X l
= 12 X 16
= 192 cm²
C. Panjang = keliling - (lebar X 2) / 2
= 46 - (15 X 2) / 2
= 46 - 30 / 2
= 16 / 2
= 8 dm
Luas = p X l
= 8 X 15
= 120 dm²