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d1=12cm
d2=2.5*12cm=30cm
P= 12cm*30cm/2
P= 360cm(kwadratowych)/2
P= 180 cm (kwadratowych)
Tak dość proste zadanie =)
d₁, d₂ - przekątne deltoidu
P - pole deltoidu
d₁ = 12 cm
d₂ = 2,5 * d₁ = 2,5 * 12 = 30 cm
P = ½ * d₁ * d₂
P = ½ * 12 * 30 = 180 cm²
Odp. Pole deltoidu wynosi 180 cm²