please solve this problem according to the class 10
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HEYA MATE......
Let the girl be at point D on the ground from the lamppost after 4 sec.
∴ AD = 1.2 m/sec × 4 sec = 4.8 m = 480 cm
Suppose the length of the shadow of the girl be x cm when she at position D.
∴ CD = x cm
In ∆CDE and ∆CAB
∠CDE = ∠CAB (90°)
∠DCE = ∠ACB (Common)
∴ ∆CDE ∼ ∆CAB (AA similarity)
∴ Length of her shadow after 4 second is 160 cm
Hope this will help u......
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you have book with solution so why do you ask on brainly
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