using P.G.T u can find the hypotenuse that will be equal to 20 units
as u get the 3 sides of the triangle PQR
sin RPQ = PERPENDICULAR DIVIDED BY HYPOTENUSE
=16 by 20 =4 by 5
cos RPQ = base by hypotenuse
= 12 by 20 =3 by 5
tan RPQ = perpendicular by base
= 16 by 12 = 4 by 3