Nancy decides to buy 30 panels for her allotment and her garden. The panels need to be treated with wood preservative. Each panel is 1.8 m long and 2 m high. 1 litre tin of wood preservative covers 12 square metres. How many tins will she need?

i.dk

Step-by-step explanation:

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

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step-by-step explanation: