Question

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Answer 1

let interior angles be 7x and 6x
sum of interior angles equal to exterior angles ( property)
7x + 6x = 130
13x = 130
x = 130÷ 13
x = 10
7x = 7 × 10 = 70
6 × 10 = 60
130 + third angle = 180( angle sum prop.)
third angle = 180- 130
third angle = 50
first angle is 70
second angle is 60
third angle is 50.

Answer 2

let the interior opposite angles be 7x and 6x
7x +6x=130°( exterior angle property)
13x=130°
x=130°/13
x=10°
opposite interior angles are
7x=7×10=70°
6x=6×10=60°
let other angle be y
60+70+y=180°(angle sum property
130+y=180°
y=180°-130°=50°