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Question

If the angles of a triangle are 300 and 450 and the included side is (3+1) cm, the area of the triangle is 12(3+1) sq.cm.

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Solution

Let A=300,B=450 so that AB=c=(3+1)..............(1)
Also C=1800(300+450)=1050
sinC=sin(900+150)=cos150
or sinC=cos(450300)=11(2)(3+1)=12(2).c by (1) ...........(2)
b=sinB.22=2B=450
=12bcsinA=12.(3+1).12=12(3+1).
1083491_1006464_ans_94d18052a60e4c71a83ba25ac85650b2.png

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