Question

in triangle ABC, angleB=90degree,BC=5cm, AB=4cm and AC=root41 cm find the value of
sinA cosA and tanA

Answer 1

angle A = 90° and angle B 30°

=> angle C = 90° - 30° = 60°

=> BC is the hyp = 8 cm long

AC = 8/2 =4cm (sin30° = AC/hp => 8sin30°=AC

AC = 8×1/2 = 4

AB = √(BC^2 - AC^2) = √(8^2 - 4^2) = √(64-16) = 6.93cm

AC = 4 cm

AB = 6.93 cm

Answer 2

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