Question

determinati masura unghiului A intr-un romb ABCD daca stim ca m(A^)= m(B^)+20grade

Answer 1

notam
m(∡B)=a
m(∡A)= m(∡B)+20°=a+20°
m(∡A)= m(∡C)=a+20°
m(∡B)=m(∡D)

m(∡A)+m(∡B)=180°
a+20°+a=180°
2a=160°
a=80°
m(∡B)=m(∡D)=a=80°
m(∡A)= m(∡C)=a+20°=80°+20°=100°