A room is 12m long, 9m wide and 8m high. Find the cosine ...
A room is 12m long, 9m wide and 8m high. Find the cosine of the angle which a diagonal of the room makes with the floor of the room
517
817
815
1217
Correct answer is A
ABCD is the floor, by pythagoras
AC2 = 144 + 81 = √225
AC = 15cm
Height of room is 8m, diagonal of floor is 15m
∴ The cosine of the angle which a diagonal of the room makes with the floor is EC2 = 152
cosine = adjhyp = 1517
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