exam Maths Puzzle Numerical Ability

Please help me to find the perimeter of triangle.

sides are 4 and sqrt 5 minus sqrt 3 and sqrt 5 plus sqrt 3.

Thanks

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exam Other Question

5.1x - 11.4 = -0.9x - 17.4 Find the radius of a circular arc of length 12cm that subtends a central angle of radian measure 1.5.