How do i find the measure indicated in bold? ? i need !

He expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. if the length is fraction 2 over 3 unit and the width is fraction 1 over 3 unit, what is the perimeter of the rectangle in units? fraction 2 over 3 unit 1 unit 1fraction 2 over 3 units 2 units

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

What is the difference between regular convex and concave polygons