Answered

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in quadrilateral ABCD shown below, AD is congruent to BD, m

In Quadrilateral ABCD Shown Below AD Is Congruent To BD M class=

Sagot :

We will use the next image

the angles in red are equals

The angle in blue is 30°

We need to remember that the sum of the interior angles of a triangle must be 180°

x is the red angle

2x+30=180

2x=180-30

x=150/2

x=75

the angle DBC can be calculated as a complementary angle, the complementary angle is formed with two angles that form an angle of 90°

angle DBC =90-75

angle DBC=15° the angle in green in the image

View image GisellaQ58871
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