Geometry Question for Title 1 Schools: Third Angle Question?

6) If two angles of a triangle are 48^o and 72^o, what is the value of the third angle?

The total angle of a triangle   = 180^o

Therefore the sum of the other two angles must be subtracted from 180^o

= 180^o  - (48^o + 72^o)

180^o  - 120^o

= 60^o