Question

How to solve the above question?

Answer 1

Here is your answer

In triangle ADC
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Angle A = 60°

Angle C= 60°

Then also by Triangle sum property rule

we comes to know that angle D= 60°

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Now we know that linear line makes an angle of 180°

so , 180°= angle ADC + angle ADB

180° = 60° + angle ADB

Angle ADB= 180°-60°= 120°

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By Triangle sum property rule,

In triangle ADB

angle A+ angleD + angle B= 180°

30°+ 120°+angleB = 180°

angle B = 30°

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Thus angle ABD= angle BAD

The opposite sides are equal of this angle

side AD= side BD

Similarly side AC= AD= CD= 4cm
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Thus side BC= BD+ DC

BC= 4cm + 4cm

BC= 8cm

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$hope \: this \: helps \: you$