Question

afla masurile unghiurilor unui paralelogram daca :
a) mB=2•mC
b) mA=2•mB+18°​

Answer 1

mA+mB=180°

mB+mC=180°

unghiurile alaturate sumt suplementare

2×mC+2×mb+18=180°

mB=2×mC=>

=>2×mC+2×(2×mC)=180°

2×mC+4×mC=180°

6mC=180°

mC=180/6

mC=30°

mB+mA=180°

mB+2×mB+18=180°

3mB=180-18

3mB=162°

mB=162/3

mB=54°

mB+mA=180°

54+mA=180

mA=180-54

mA=126°

mA+mB+mC+mD=360°

126+54+30+mD=360

210+mD=360°

mD=360-210

mD=150°