Question

in A parallelogramABCD,iftriangleA=115degree find trianglleB,triangleC and triangleD​

Answer 1

Answer:

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Step-by-step explanation:

adjacent sides of parallelogram are equal

therefore,A=C=115°,SO B=D=?

measure of all angles of parallelogram =360°

A+B+C+D=360

115+B+115+B=360

230+2B=360

2B=360-230

2B=130

B=65

therefore,

B=65

C=115

D=65

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Answer 2

Answer:

given,

angle A =115°

w.k.t,

in a parallelogram opposite angles are equal

then angleA =angle C =115°

and angle B=angle D

now,

angle A + angle B+ angle C+ angle D= 360°(angle sum property in a parallelogram)

=115°+angle B+115°+angle B=360°(angle B=angle D)

=230°+2 angle B=360°

=2 angle B=360°-230°

=2 angle B=130°

=angle B =130/2=65°

angle B=angle D=65°

therefore,

angle B= 65°

angle C=110°

angle D=65°