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= (5 + √3) x (5 - √3)
= 25 + 5√3 - 5√3 - 3
= 25 - 3
= 22 cm²
panjang diagonalnya: d
d² = (5 + √3)² + (5 - √3)²
d² = 25 + 10√3 + 3 + 25 - 10√3 + 3
d² = 56
d = √56
d = 2√14 cm
semoga membantu ya :)