Question

find the three angels of quadrilateral triangle​

Answer 1

Answer:

Subtract the sum of the angles from 180 to get the third angle of the triangle. For example, if you have a triangle within a quadrilateral that has the angles 20 and 45 degrees you would get a third angle of 115 degrees (180 - 65 = 115).

Step-by-step explanation:

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Answer 2

Answer:

subtract the sum of the angles from 180 to get the third angle of the triangle .

for example if you have a triangle within a quadilateral that has the angles 20 and 45 degrees you would get a third angle of 115 degrees ( 180 - 65 = 115 ) .

add the two known angles of the quadilateral with the new angle .

Step-by-step explanation: