Sebuah persegi panjang mempunyai panjang (5+√3)cm, sedangkan lebarnya (5-√3). tentukan luas & panjang diagonalnya!
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L = (5 + √3)(5 - √3)
L = 25 - 5√3 + 5√3 - 3
L = 22 cm²
d² = p² + l²
d² = (5 + √3)² + (5 - √3)²
d² = (25 + 10√3 + 3) + (25 - 10√3 + 3)
d² = 28 + 10√3 + 28 - 10√3
d = √56
d = 2√14 cm