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3x + 17 = 5x-13
3x - 5x = -17 - 13
-2x = -30
x = 15
D1
= 3x + 17
= 3(15) + 17
= 45 + 17
= 62
untuk panjang 1/2 diagonal adalah 62/2 = 31
Menghitung sisi sisinya, dengan phytagoras :
S² = 31² + 31²
S² = 961 + 961
S² = 1922
Luas persegi
= S x S
= S²
= 1922m
Jawabannya adalah C.1922m².