Answer: 7cm
Explanation:
Using Pythagoras Theorem (Pythagorean Theorem), the equation to find the hypothenuse (side c) of a triangle is 
 +
+
 =
=
 
 
In this case the hypothenuse is 11 cm and side b is 6cm.
therefore, 
 +
+
 =
=

make a the subject 
 =
 =
 -
 - 

 = 85
 = 85 
a = 9.23 (nearest hundredth)