WAEC - Mathematics (1996 - No. 36)
Two angles (a + 31) and (b - 49o) are adjacent angles on a straight line. Which of the following is true
a + b = 198o
a + b = 180o
a + b = 162o
a + b = 100o
a + b = 80o
Vysvětlení
a + 31 + b - 49 = 180o(sum of angles on str line)
a + b - 18 = 180o
a + b = 180 + 18
a + b = 198o
a + b - 18 = 180o
a + b = 180 + 18
a + b = 198o