23) It is right angle triangle, so the sum of acute angle must be equal to 90
sum of ratio units = 2+7 = 9
value of 1 unit = 90/9 = 10
measures of angle would be 2(10) & 7(10) = 20 & 70
Measure of smaller angle is 20
24) It is only graphical work. You have to do it on your own cause I can't show you here, sorry!!