sir I have a doubt about whether a problem is correct or not. I am posting the problem. ABC and DBC are both isosceles triangles on a common base BC such that A and D lie on the same side of BC.Are triangles ADB and ADC congruent?If so then if angleBAC=40 and angleBDC=100,then find ADB.The answer is given as 130.

Arindam Chakraborty , 9 Years ago

Grade 7