Question

need help with this question please

Answer 1

Answer:

angle BDC will be 80°.

In triangle ABC,

B + C + A = 180° .... ( sum of all angles of triangle is 180°)

69°+31°+A = 180°

100° + A = 180°

A = 180° - 100° = 80°

triangle ABC & triangle BDC are congruent triangles because they intersected in one circle.

that's why ABC = BDC

BDC = 80° ,... ( ABC = 80°)

Answer 2

Step-by-step explanation:

angle A + angle B + angle BCA = 180 (angle sum property)

angle A + 69° + 31° = 180°

angle A = 180° - 100°

angle A = 80°

Angle A = Angle D (Angle in the same segment are equal)

Angle A = 80°

Therefore Angle D = 80°