Question

Tính số đo góc A,B biết góc A - B = 30^o và

a/ chúng bù nhau 

b/ chúng phụ nhau

Answer 1

a) \(\widehat{A}\)và \(\widehat{B}\)bù nhau

\(\Rightarrow\widehat{A}+\widehat{B}=180^o\)

mà \(\widehat{A}-\widehat{B}=30^o\)

\(\Rightarrow\widehat{A}=\frac{180^o+30^o}{2}=105^0\)

\(\Rightarrow\widehat{B}=180^o-105^o=75^o\)

Answer 2

b) \(\widehat{A}\)và \(\widehat{B}\)phụ nhau

\(\Rightarrow\widehat{A}+\widehat{B}=90^o\)

mà \(\widehat{A}-\widehat{B}=30^o\)

\(\Rightarrow\widehat{A}=\frac{90^o+30^o}{2}=60^o\)

\(\Rightarrow\widehat{B}=90^o-60^o=30^o\)

Answer 3

thank bn