Question

Three angles of a quadrilateral are 600, 800 and 1200. What is its fourth angle?
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Answer 1

Answer:

the fourth angle is 100°.

Step-by-step explanation:

Angle sum property of quadrilateral =360°

So, let the fourth angle be x.

60°+80°+120°+x°=360°

260°+x°=360°

x°=360°-260°=100°

Therefore, the fourth angle is 100°.

hope it helps you

Answer 2

ANSWER:

THE ANSWER IS     100                                                                                                                                                                                                                                      Step-by-step explanation:

USING ANGLE SUM PROPERTY OF A  QUADRILATERAL,

A+B+C+D=360

GIVEN,

60+80+120+D=360

260+D=360

D=360-260

D=100

SO,THE FOURTH ANGLE IS 100