[" 15."AD" is an altitude of a "/_ABC" and "AD" is "12cm],[BD=9cm" and "DC=16cm" long respectively.Prove "],[" that the angle "BAC" is a right angle."]

In a ABC,AD is the altitude from A such that AD=12cm.BD=9cm and DC=16 cm.Examine if ABC is right angled at A

Answer any One question : In triangleABC , AD is perpendicular on BC and AD^2 = BD . DC, prove that angleBAC is a right angle.

ABC is a triangle and D is a point on the side BC. If BC = 12 cm, BD = 9 cm and angle ADC = angle BAC, then the length of AC is equal to

AD and BE are respectively altitudes of triangle ABC such that AE=BD. Prove that AD=BE.

G is the centroid of Delta ABC . The medians AD and BE intersect at right angles . If the lengths of AD and BE are 9 cm and 12 cm respectively , then the length of AB (in cm ) is ?

O is the centroid of triangle ABC . The medians AD and BE intersect at right angles. If the lenghts of AD and BE are 9 cm and 12 cm respectively : then the length of AB (in cm) is