Question

if andel 1 + angel 3=120,then angel 2+ angel 4 is eqal to
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Answer 1

Answer:

Answer

<1=<2

<3=<4

Adding <1 to both angles

<3+<1 = <4+<1

As mentioned above, <1=2 Therefore, <3+<1=<2+<4

Which means: <ABC = <DBC

The Euclid's axiom used here is: "If equals are added to equals, the wholes are equal."