Answer:
Explanation:
We have, Two angles of the quadrilateral are 30 and 40.
• First angle will be 30° and the Second angle will 40°
• the remaining two angles are equal. Let us consider the remaining two angles be ,
- Third angle = x
- Fourth angle = x
As we know that sum of all the angles of the quadrilateral is 360°
1st angle + 2nd angle + 3rd angle + 4th angle = 360

combining like terms,

subtract 70 from both sides,


Divide both sides by 2

• Since the remaining two angles are equal. Hence, the measure of the third and fourth angle be 145°.
• Therefore the the measure of all the angles of the quadrilateral is 30°, 40°, 145° and 145°