Question

Calculate the angles marked with small letters in the diagrams.

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Answer 1

Step-by-step explanation:

as the diagonals of the rectangle bisect each other and they are equal so AO=OB

so,

angle OAB=angle OBA=18°

as angle ABC=90° so angle OBC=x=(90-18)°=72°

Answer 2

Answer:

<CAB=18°

AB and DC are parallel to each other.

so, <CAB=<ACD=18°

since, the given figure is a rectangular,

<BCD=90°

so, x°=90°-<ACD

=90°-18°

= 72°