Question

the number of diagonals of a regular polygon exceeds the number of diagonals of another regular polygon by 105. if the number of sides in the first polygon exceeds that in the second by 5, then the exterior of the second polygon is....

Answer 1

what's exterior angle, use the formulae
$n \times (n - 3) \div 2$
for find the number of diagonal in regular polygon where n is number of sides of regular polygonand equate them