If the difference between the interior and exterior angles of a regular polygon is 144°, then what is the number of sides of the polygon ?

If each interior angle of a regular polygon is 150°, then the number of sides in that polygon is :

If one angle of a triangle is 50° and difference between the remaining two angles is 30°, then the value of smaller angle is :

If the difference between the circumference and radius of a circle is 37 cm, then the area of the circle is

If a, b and c are the sides of a right-angled triangle, where a > b > c, then what is the value of the expression (a + b + c) (a + b - c) (a - b + c) (a - b - c)?

Two rectangles are of same area equal to 480 square cm. They differ in lengths by 6 cm and breadths by 4 cm. What is the difference in their perimeters?