Josie spots her brother Dan from the roof of a block of flats. The angle of depression from Josie to Dan is 45°
The distance from Josie directly to Dan is 80 metres.
Calculate the height of the block of flats.
Give your answer correct to 2 decimal places.

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step-by-step explanation:

it works trust me

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

step-by-step explanation:

no of data

divide by no of mode

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2