ABC and DBC are two isosceles triangles on the same side of BC. Prove that : (I) DA produced bisects BC at right angle. (II) Angle BDA = Angle CDA

gstr 1

• Eight class mathematics

Class 7 chapter number 2 example number 5

Interrogation of✓tanx of dx

Mr das wants to invest ₹12000 in public provident fund and in national bomds. He has to invest at least ₹1000 in PPF and at least ₹2000 in bonds. If the rate of interest on PPF is 12% per annum and that on bomds is 15% per annum,how should he invest the money to earn maximum annual income?also find the maximum annual income