If the angles of a triangle are in the ratio of 2:3:7, then find the ratio of the greatest angle to the smallest angle.

D, E, F are the mid - points of the sides BC, CA and AB respectively of a ΔABC. Then the ratio of the areas of DEF and ΔABC is D, E, F.

ABCD is a trapezium in which AB‖CD. M and N are the mid points of AD and BC respectively. If AB=14 cm and MN=15 cm, find CD.

If ∆ABC is an isosceles triangle with ∠C = 90° and AC = 5 cm then AB is : 

If the perimeter of an equilateral triangle is 18 cm, then length of each median is

In the given figure, AB‖DC,  ∠BAD=90°,   ∠CBD=28° and ∠BCE=65°, Then ∠ABD=?

If the sum of the interior angles of a regular polygon be 1080 °, the number of sides of the polygon is 

In a trapezium ABCD, AB and DC are parallel to each other with a perpendicular distance of 8 m between them. Also, (AD)=(BC)=10 m, and (AB) = 15 m <(DC). What is the perimeter (in m) of the trapezium ABCD?