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In Δ ABC AB = AC, P and Q are points on AC and AB respectively such that CB = BP = PQ = QA then the value of ∠AQP is [ ] 1)2π/7 2)3π/7 3)4π/7 4)5π/7

In Δ ABC AB = AC, P and Q are points on AC and AB respectively such that CB = BP = PQ = QA then the value of ∠AQP is [ ]
1)2π/7
2)3π/7
3)4π/7
4)5π/7
 

Grade:7

2 Answers

Vikas TU
14149 Points
one year ago
Dear student 

AB = AC (given)
=>
BC = BP ( given)
=>
& PQ = AQ (given)
=>
=>
=>
=>
Now, in triangle ABC
2x + a = 180 ( angle sum property of a triangle) ……………………… (1)
In triangle BCP
x + x + x-2a = 180 ( angle sum property of a tri)
=> 3x - 2a = 180 ……………… (2)
By solving eq (1), & (2)
Eq(1): 4x + 2a = 360
Eq(2): 3x - 2a -= 180
=> 7x = 540
=> x = 540/7 deg
=>a=180/7(by substituting the value of x)
=>
=>
=>
 
Vikas TU
14149 Points
one year ago
AB = AC (given)
=> ABC = ACB = x deg ( angles opposite to equal sides of a triangle)
BC = BP ( given)
=> BCP=BPC = 'x' deg
& PQ = AQ (given)
=> QPA = QAP = 'a' deg
=> PQB = 2a deg ( exterior angle = the sum of interior opposite angles)
=> PBQ = 2a deg ( as PQ = PB , given)
PBC = (x-2a) deg
Now, in triangle ABC
2x + a = 180 ( angle sum property of a triangle) ……………………… (1)
In triangle BCP
x + x + x-2a = 180 ( angle sum property of a tri)
=> 3x - 2a = 180 ……………… (2)
By solving eq (1), & (2)
Eq(1): 4x + 2a = 360
Eq(2): 3x - 2a -= 180
=> 7x = 540
=> x = 540/7 deg
=>a=180/7(by substituting the value of x)
=>  AQP = 180 - 2a = 180- 2*180/7
=>  AQP = 180–360/7 = 900/7 deg
=> AQP = (Pi * 900)/(7*180) = 5pi/7
 AQP = 5pi/7 radian

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