If ∆ABC is a right angled triangle with angle B= 90° ,angle A=30°, AC=18, then BC will be
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Step-by-step explanation:
FRST FINDBTHE ANGLE C THAT IS =60 DEGREE(180-90 + 30=60)
VALUE OF COS 60 DEGREE=BASE÷HYPOTENUSE =
BC÷AC
COS 60 =BASE÷HYPOTENUSE
1÷2=BC÷18
BC=9
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