INEEDHELP1211 INEEDHELP1211
  • 21-11-2017
  • Mathematics
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I need help I've been trying but couldn't get it

I need help Ive been trying but couldnt get it class=

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trombonebookworm
trombonebookworm trombonebookworm
  • 21-11-2017
Since angles that add up to make a line add up to 180 degrees, you know

Angle ACD + angle ACB=180

Since it tells you ACD is 100, substitute that in.

100+ACB=180
ACB=80

Next, the sum of all the interior angles in a triangle is 180.

ACB+A+B=180.

Substitute in the values you know.

80+A+60=180
A=40

Angle a is 40 degrees.

Hope this helps!
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