the three angles of quadrilateral are 70, 120,100 find the measure of third angle
Answers
Answer:
Quadrilaterals are four sided polygons, with four vertexes, whose total interior angles add up to 360 degrees. The most common quadrilaterals are the rectangle, square, trapezoid, rhombus, and parallelogram. Finding the interior angles of a quadrilateral is a relatively simple process, and can be done if three angles, two angles, or one angle and four sides are known. By dividing a quadrilateral into two triangles, any unknown angle can be found if one of the three conditions are true.
3 Angles
Divide the quadrilateral into two triangles. You will need to split two of the angles in half when you divide the quadrilateral. For example if you had an angle of 60 degrees it will become 30 degrees on both sides of the dividing line.
Add the sum of the angles for the triangle with the missing angle. For example if one of the quadrilateral's triangles had the angles 30 and 50 degrees, you would add them together to get 80 degrees (30 + 50 = 80).
Subtract the sum of the angles from 180 degrees to get the missing angle. For example if a triangle in a quadrilateral had the angles of 30 and 50 degrees, you would have a third angle equal to 100 degrees (180 - 80 = 100).
Step-by-step explanation:
mark me as brainliest
Answer:
70
Step-by-step explanation:
70+120+100+x=360
290+x=360
x=360-290
x=70