A circle touches the side BC of A ABC at P and touches AB and AC produced at 0 and R respectively as shown in the adjoining figure if AO -5 cm sternal find the perimeter of SABC
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Step-by-step explanation:
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Answer:
GIVEN: A circle touching the side BC of AA BC at P and AB, AC produced at Q and R. To Prove: AQ = 1/2 (Perimeter of AA BC)
PROOF:
AQ = AR
B Q = BP
[From A]. (1)
[From B]...(2)
CP = CR. [From C].(3)
Lengths of tangents drawn from an external point to a circle are equal.
Perimeter of AA BC = AB + BC + CA Perimeter of AA BC=AB+ (BP+ PC) + (AR-CR)
Perimeter of AA BC = (AB + B Q) + (PC) + (AQ - PC)
[From EQ 1,2 & 3, AQ = AR, B Q = BP, CP = CR]
Perimeter of AA BC = AQ + AQ = 2AQ
Perimeter of AA BC = 2AQ
AQ = 1/2 (Perimeter of AA BC)
Hence, AQ is half the perimeter of A ABC.
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