The half of 3/4 is 0.375, or 3/8. All you have to do is multiply 3/4 times 1/2.
The exterior angle is supplementary to the adjacent angle (they form a linear pair) and is the sum of the two angles in the triangle that are not adjacent to it. For example, in number 2, the exterior angle is 28+40=68 degrees. You can use the other method to check. 68 degrees is supposed to be in a linear pair with 112 degrees, which it is. So the answer to number 2 would be 68 degrees.
Try doing this for the rest of them
~45.25 because the formula for circumference is 2(3.14286)a or 2(3.14286)7.2
When you divide fractions multiply the first fraction by the reciprocal of the second
-5/7 divide by 1/5 turns into
-5/7 multiply by 5/1
Answer is -25/7
