I don’t understand this if you could help I would appreciate it

the 3 and 6 tell you how much of that area equals 3 length and 6 width. All 4 shapes on the outside are right angles and what are squares made out of right angles. All 4 sides of a square is defined as right angles. I can’t see much but it can either multiply or add.

Step-by-step explanation:

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13