The word supplementary means equal to 180 degrees. The ratio is 2:4, meaning that you have to set up the equation 2x+4x=180. Next, combine like terms which should get you 6x=180. After that, divide 6 on both sides of the equation which should leave you with x=30. The smaller angle is 2x, so substitute 30 making the smaller angle 2(30) which equals 60. 60 is the measure of the smaller angle.
The formula for the area of a triangle is 1/2*b*h The best thing to do is to multiply the answers then half them. 7*12= 84 84/2= 42 Therefore, the area is 42cm2 Hope this helps :)