Question

please answer me this question​

Answer 1

Step-by-step explanation:

because the angles opposite to equal sides are equal angle BCD is equal to angle bdc

so 180 - 70 is equal to 110

because they are equal 110 is divided by 2 to get 55 and 55 degree so angle BCD and bdc are 55 degree each

Answer 2

Answer:

given ABC is an isosceles triangle

let the base be Ac then angle c and angle a are equal

wkt

sum of angles of triangle is 180

90 plus angle a plus angle c = 180

angle a and c be x

90 plus x plus x=180

90plus 2x=180

2x=90

x=45 be 1

similarly in triangle cde

angle c =55. be 2

angle BCa plus angle ECD=angle BCD (from fig)

adding 1 and 2

angle BCD = 90

hence proved