Will mark brainlest pls dont answer if you don't know! fill in the table by following the rules provided for each backpack

Triangle BDC is an isosceles. 
So, angle DBC = angle DCB.

180° - 100° =80°
80÷2=40.

Angle C = 40°

Angle ABD is half angle DBC, so <ABD = 40°÷2=20° 
Therefore, angle ABC=20°+40°=60°
To get the angle A, use the angles in a triangle ABC.

180° - (60°+40°)=80°

Angle A = 80°