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50°
Step-by-step explanation:
since it is given that triangle abc=pqr
a=p=60°
b=q=70°
c=r=x°
in triangle pqr p+q+r=180°(angle sum property)
= 60°+70°+x°=180°(from the derivation above)
x°=180°-60°-70°
=180°-130°
=50°
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