CBSE Class 10 Answered
in triangle PQR right anhled at Q, PR+QR = 25cm and PQ = 5cm. Determine the values of sinP, cosP and
Asked by prernamehta | 08 Jan, 2010, 07:42: PM
Expert Answer
Pythagorus's theorem gives,
PR2 = PQ2 + QR2
PR2 - QR2 = PQ2 = 52 = 25
(PR + QR)(PR - QR) = 25
(PR - QR) = 25/25 = 1
PR - QR = 1
and PR + QR = 25,
Solving the two equations,
PR = 13 and QR = 12.
Hence sin P = 12/13
cos P = 5/13
and tan P = 12/5
Regards,
Team,
TopperLearning.
Answered by | 08 Jan, 2010, 11:43: PM
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