Looks like a regular hexagon
see my attachment
we put some imaginary lines and take the 2 trignles on the right and put them on teh left side
now we have a rectangle wit height 8 and width 2+4 or 6
area=8*6=48 cm^2
Answer:
Range=highest - lowest
80-20=60
Similarly
Q1=N/4=15
Q2=60/2=30
Q3=3*60/4=45
Interquartile range=Q3-Q1=45-15=30
Slot method
12 in 1st slot
11 in 2nd slot
10 in 3rd slot
12*11*10=1210 possible permutations
Sec θ = 1/cosθ
sec 19° = 1/cos19°
≈ 1/0.9455 ≈ 1.0576 ≈ 1.058