3x+8=15
move +8 to the other side
sign changes from +8 to -8
3x+8-8= 15-8
3x= 15-8
3x= 7
divide both sides by 3 to get x by itself
3x/3= 7/3
answer:
7/3 or 2 1/3
<u>Given </u><u>:</u><u>-</u><u> </u>
<u>To </u><u>prove</u><u> </u><u>:</u><u>-</u><u> </u>
- Sum of interior angles of a ∆ is 180° .
<u>Construction</u><u> </u><u>:</u><u>-</u>
- Draw a line MCN parallel to AB .
- Extend line AB to K .
<u>P</u><u>roof </u><u>:</u><u>-</u><u> </u>
In ∆ ABC , we have ,
As sum of two interior angles of a triangle is equal to the opposite exterior angle .
Also ,
ABC +
CBK = 180°
( linear pair )
Hence from above two ,
<u>Hence </u><u>Proved</u><u> </u><u>!</u><u> </u>
So firstly you are given the external angles, to find the internal angles, you do 180-133=47
180-142=38
the internal angles in a triangle add up to 180, therefore it is
47+38=85
180-85=95
because you have to find the external angle=n you then need to take 95 away from 180
180-95=85
so the answer is A
Answer:
Basically, the measure of an exterior angle of a triangle is equal to the sum of the measures of the remote interior angles. It's significance for solving angles of a triangle is the measure of angle D is equivalent to the sums of A & B.
Step-by-step explanation: