Given: △dmn, dm=10√3 m∠m=75°, m∠n=45° find: perimeter of △dmn

Correct Answer is: Perimeter of ΔDMN is 54.873 units.

Solution:-

Given that DM=10√3,m∠M=75°,m∠N=45°

So,m∠D= 180-(75+45) = 60°

So to find perimeter we need other 2 sides also.

Let us use sine rule to find them.

Hence perimeter = DM+MN+DN

                             = 10+21.213+23.66

                             =54.873 units

correct answer:

b.(19,-2)