In triangle ABC if a=10 and R =5 then find angle A
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given data
triangle ABC
a=10(a=h)
R=5(R=b)
Area of triangle ABC=h×b/2
A=10×5/2
A=50/2
A=25
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area of triangle ABC=h×b÷2
A=10×5÷2
A=50÷2
A=25
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