Answer:
1/2 (9)3.1 = 13.95
1/2 (6)5.5 = 16.5
1/2 (12)4.4 = 26.4
1/2 (4)6.7 = 13.4
it is easy use the formula of triangle which is 1/2(base × height) and base is the side where the height touches and height means the perpendicular line.
And in some cases there may be the use of pythagoras theorem
5.1m questions
6.7m answers