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y x 4y/2 = 450
2y^2 = 450
y^2 = 450/2 = 225
y = 15 cm
d1 : d2
= 15 : 4(15)
= 15 : 60
d1 = 15 cm
d2 = 60 cm
2 = 1 × 15
450 = 1x × 4x = 15 cm
2 d2 = 4x
= 4x² = 4 × 15
2 = 60 cm
450 × 2 = 4x²
900 = 4x²
900 = x²
4
225 = x²
√225 = x
15 = x