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10+6 = 16
16-12 = 4
20-10=10
b) 12+x=16
x=16-12
x=4
c)x+10=20
x=20-10
x =10
a²=6
a=√6
b²=10
b=√10
c²=a²+b²
c²=(√6)²+ (√10)²
c²=6+10
c²=16
c=√16
c=4cm
P₃=a²
P₃=4₂
P₃=16
b)P=a²
a²=12
a=√12
c²=16
c=√16
c=4
b²=c²-a²
b²=4²-(√12)²
b²=16-12
b²=4
b=√4
b=2
P=b²
P=2²
P=4
c) P=10