Patru unghiuri formate in jurul unui punct, ∡A ∡B ∡C si ∡D ,respecta relatia:
m(∡A)/7 = m(∡B)/9 = m(∡C)/11 = m(∡D)/13 . Care este masura celui mai mare unghi?
o sa notez a,b,c si d unghiurile a/7=b/9=c/11=d/13 b=9a/7 c=11a/7 d=13a/7 a+9a/7+11a/7+13a/7=360⁰ 7a+9a+11a+13a=2520⁰ 40a=2520⁰ a=63⁰ b=9×63⁰/7=81⁰ c=11×63⁰/7=99⁰ d=13×63⁰/7=117⁰
