Question

The diagram shows three straight lines.
с
110°
b
а
21
Work out the sizes of angles a, b and c.
b=
+
+

Answer 1

Answer:

a=21°b=70°c=89°

Step-by-step explanation:

a=21°[by vertical opposite angle]

b+110°=180°[by linear angle]

b=180°-110°=70°

a+b+c=180°[by sum of all angle]

21°+70°+c=180

91°+c=180°

c=180°- 91°

c=89°