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luas = (5+√2)(5-√2) = 25 - 5√2 +5√2 -2 = 25 -2 = 23 cm²
K = 2 ( p + l ) ==> p = panjang, l = lebar, K = keliling
p = , l =
Masukan panjang dan lebarnya ke rumus keliling
K = 2 ( p + l )
= 2 ( ( + )
= 2( + 2
= 10 + 2√2 + 10 - 2√2
= 20 + 2√2 - 2√2 = 20 cm
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Rumus mencari luas persegi panjang
L = p * l
Rumus perkalian di dalam kurung
misal = (a + b ) * (a - b)
= (a*a + b*a - a*b -b*b)
= a² + ab - ab - b² = a² + b²
masukan panjang dan lebarnya ke rumus
L =
= (5*5 + √2*5 - 5*√2 - √2*√2)
= 25 + 5√2 - 5√2 - 2 = 25 - 2 = 23 cm²
kurang lebihnya seperti ini