In a right triangle ABC angle C = 65 degree, AB= 5cm. find the length of side BC
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Given : In a right triangle ABC angle C = 65 degree, AB= 5cm
To Find : length of side BC
Solution:
In a right triangle ABC ∠C = 65°
Assuming right angle at B
Cos ∠C = BC /AB
BC = ?
AB = 5
Cos65° = BC/5
=> BC = 5Cos65°
=> BC = 5(0.42262)
=> BC = 2.1131 cm
Assuming right angle at A
Sin ∠C = AB /BC
BC = ?
AB = 5
Sin 65° = 5/BC
=> BC = 5/Sin65°
=> BC = 5.5169 cm
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