Question

Calculate the value of y in Fig. 16.9 and
reasons for your answers.
Ingles in triangles (Re
The sum of angles in a tri
Exercise 16.1
A
to 180°
Find the marked angles in Fig. 168 and give
reasons for your answers.
7
y +10
38°
58°
8
112°
2
y+20°
96
Fig 16.10
78°
b
43°
9
158°
a + b + c = 180°
L.e. BÂC + ABC + ACE
The exterior angle of
to the sum of the
angles.
3
y + 20°
y + 60°
102°
с
a
b
А
a
10
5W
у
4y2y
b​

Answer 1

Answer:

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