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11-03-2021
Mathematics

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Use the figure below to find the distance across the river (IK)

Use the figure below to find the distance across the river IK class=

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11-03-2021

JK = 18m

_______________

Step-by-step explanation:

ΔJLK = ΔNLM ( vertically opposite Δ)

ΔJKL = ΔNML ( each 90° )

so,

triangle JKL = triangle NML (by AA similarity)

JK / KL = NM / ML

JK / 21m = 42m / 49m

JK = 42 × 21 ÷ 49

JK = 18m

_______________

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