Which of the following device is used to produce hard

∆ABC and ∆DEF are similar and their areas are respectively 121 cm² and 144 cm ² . If EF = 24 cm BC is?

Angles of a triangle are in the ratio 2 : 3 : 7. Find the sum of the smallest and largest angle of the triangle.

The radius of a circle is 25 cm, and the length of the chord is 14 cm. Find the distance between the chord and the centre of the circle.  

The length of the each side of an equilateral triangle is 42√3 cm . The area of circumcircle, (cm ² ) is

Angles of a triangle are in the ratio 5 : 6 : 7. Find the difference between the largest and smallest angle of the triangle.

The length of the each side of an equilateral triangle is 14√3. The area of incircle, (cm ² ) is

If in a ΔABC, the external angle bisector of angle A, meets BC when extended at a point D, BD = 6cm , BC = 4 cm then what is AB:AC ?

The length of the each side of an equilateral triangle is 42√3. The area of incircle, (cm ² ) is