Question

Find the measures of each of the unknown anglen
anglen denated by
the letters of English alphalect.​

Answer 1

180 = 50 + x + x (Triangle sum property)

180 = 50 + 2x

2x = 180 - 50

2x = 130

x = 130/2

x = 65

Answer 2

Step-by-step explanation:

a.

$20 + 140 + x = 180 \\ \\ = > x = 180 - 160 = 20$

b.

$50 + x + x = 180 \\ \\ = > 50 + 2x = 180 \\ \\ = > 2x = 180 - 50 = 130 \\ \\ = > x = \frac{130}{2} = 65$

c.

$90 + 40 + a = 180 \\ \\ = > a = 180 - 130 = 50$

THESE ALL FOLLOW TRIANGLE SUM PROPERTY.