In the adjoining figure, PQR is a right triangle right angled at Q. If PQ = 4 cm and PR = 8 cm then angle P is equal to
(a) 60
(b) 45
(c) 30
(d) 15
Answer :
cos P = PQ/PR
cos P = 4/8
= 1/2
cos P = 1/2
cos P = cos 60
so, P = 60
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