Part 1:
3+2+1 = 6 total units
There is only 1 history book.
1/6 total.
Part 2:
6-1 (we've lost the history book) = 5 total units
3 novels. = 3/5
Part 3:
1/6 * 3/5 = 3/30 or 1/10
- Total number of fabric Mrs. King has =

- Number of yards of fabric used for a blanket =
- Number of yards of fabric used to make a pillow =

- To find the number of yards of fabrics Mrs. King has left, we apply the operations of Addition and Subtraction
- Step 1 : Addition Operation
Total number of fabrics used by Mrs. King = Fabric used for blanket + Fabric used for pillow

= 
- Step 2 : Subtraction Operation
Total number of yards of fabric left = Total number of fabrics - Total number of fabrics used

= 
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So you know that this triangle must be a 45-45-90 degree triangle (you can tell this from the picture!)
The side that is length 4 is opposite from the 45 degree angle, and remember that congruent angles also give you congruent sides. This means that the length of a must be equal to the length of 4, because both are located opposite a 45 degree angle.
To find b, you must know that the hypotenuse of a 45-45-90 triangle is just equal to a

. Thus, the length of b= 4 rt. 2