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Question : In $\triangle$ABC, $\angle$A = $90^{\circ}$, BP and CQ are two medians. Then the value of $\frac{BP^2 + CQ^2}{BC^2}$ is:

Option 1: $\frac{4}{5}$

Option 2: $\frac{5}{4}$

Option 3: $\frac{3}{4}$

Option 4: $\frac{3}{5}$


Team Careers360 13th Jan, 2024
Answer (1)
Team Careers360 19th Jan, 2024

Correct Answer: $\frac{5}{4}$


Solution :
Since BP and CQ are two medians. So, Q and P are midpoints of AB and AC respectively.
AQ = BQ = $\frac{1}{2}$AB
AP = CP = $\frac{1}{2}$AC
In $\triangle$AQC,
$\angle$A = $90^{\circ}$
By Pythagoras theorem,
⇒ CQ 2 = AC 2 + QA 2
⇒ 4CQ 2 = 4AC 2 + 4QA 2
⇒ 4CQ 2 = 4AC 2 + (2QA) 2
⇒ 4CQ 2 = 4AC 2 + AB 2 ------------(i)
In $\triangle$ BPA,
⇒ BP 2 = BA 2 + AP 2
⇒ 4BP 2 = 4BA 2 + 4AP 2
⇒ 4BP 2 = 4BA 2 + (2AP) 2
⇒ 4BP 2 = 4BA 2 + AC 2 ------------(ii)
Adding (i) and (ii),
⇒ 4CQ 2 + 4BP 2 = 4AC 2 + AB 2 + 4BA 2 + AC 2
⇒ 4(CQ 2 + BP 2 ) = 5AC 2 + 5BA 2 = 5(AC 2 + AB 2 ) = 5BC 2
⇒ $\frac{BP^2 + CQ^2}{BC^2}$ = $\frac{5}{4}$
Hence, the correct answer is $\frac{5}{4}$.

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