Question

triangle ABC is an isosceles triangle in which ab= ac . d is the midpoint of base bc. prove that triangle abd is congruent to triangle acd. if m angle b = (3x + 10) degree and m angle c =70 degree , find the value of x​

Answer 1

Answer:

Step-by-step explanation:

ABC is an isosceles triangle in which AB = AC and AD is the bisector of <BAC.

In triangles ABD and ACD

<B = <C

AB = AC

AD is common.

Therefore triangles ABD and ACD are congruent, and so

<ADB = <ADC = 90 degrees because BCD is a straight line and = 180 degrees.

QED.

Method 2:

When AD is the bisector of BC

ABC is an isosceles triangle in which AB = AC and AD is the bisector of BC.

In triangles ABD and ACD

<B = <C

AB = AC

BD = CD.

Therefore triangles ABD and ACD are congruent, and so

<ADB = <ADC = 90 degrees because BCD is a straight line and = 180 degrees.

QED.

Answer 2

Answer:

that is the worng ehghe d