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a = 3 cm
b = 6 cm
przekątne to : d1 oraz d2
(d1)² = 3² + 6²
d1 = √45 = 3√5 cm - jedna z przekątnych
P = a × b × sin 90° = 18 × 1
P = 18 cm²
P = 0,5 × d1 × d2 / × 2
3√5 × d2 = 36 / ÷ 3√5
d2 = 12/√5 × √5/√5
d2 = 12√5/5 cm - druga z przekątnych