Which committee recommended the concept of Working

The sides of a triangle are 10 cm, 17 cm, and 21 cm. Find the area of the triangle using Heron’s formula.

In ∆ABC , G is the centroid , AB = 12 cm, BC= 16 cm and AC = 20 cm , find GD, where D is the mid-point of BC?

If O is circumcentre of acute angled triangle ABC, if ∠  BOC = 100˚  then  ∠ BAC = ?

In ΔABC, PQ is parallel to BC If AP: PB= 3:4 and AQ= 6 cm, AC is equal to?

The internal bisector of ∆ABC at ∠A cuts BC on D and cuts the circumcircle at E. If DE = 6cm, AC = 8cm and AD = 10 cm, then find the length of AB?

If I is the incentre of ΔABC , if  ∠ BIC = 130⁰  , then what is the measure of  ∠ BAC?

AC and CE are the medians of triangle ABD and ACD respectively. If area of triangle ACE is 15 cm ² , then find the area of triangle ABD.

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

If the volume of a cube is 64cm³, then the diagonal of cube is