15.‘O’ is the centre of the circumcircle of triangle of ABC.A = 40, B = 80, C = 60. BC=6.4cm
a) What is the diameter of the circle?
b) What is the length of the other two sides? (5 marks)
40 60 80
sin 0.64 0.87 0.98
cos 0.77 0.50 0.17
tan 0.84 1.73 5.67
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Answer:
(A) Given : In ΔABC AB = c BC = a = 6.4 cm AC = b ∠A = 40°, ∠B = 80°, ∠C = 60° Let ‘R‘ be the radius of circumcircle of ΔABC.
(B) Sides are 9.8 cm and 8.7 cm.
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