127,221 views
17 votes
17 votes
Please help!
find measure of CDE ​

Please help! find measure of CDE ​-example-1
User Uzair Riaz
by
2.0k points

1 Answer

19 votes
19 votes

Answer:

170

Explanation:

A heptagon's internal angles add up to 900 degrees.

So:

(2x-13)+(3x-8)+(2x-3)+(2x-7)+(3x-1)+(2x+11)+(2x+9) = 900

16x - 12 = 900

16x = 912

x = 912/16

x = 57

So:

3x - 1 = 3 * 57 -1 = 170

User Bialpio
by
2.4k points