A room is 12m long, 9m wide and 8m high. Find the co...
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
1517
817
815
1217
Correct answer is A
ABCD is the floor. By pathagoras
AC2 = 144 + 81 = √225
AC = 15cm
Height of room 8m, diagonal of floor is 15m
Therefore, the cosine of the angle which a diagonal of the room makes with the floor is
EC2 = 152 + 82 cosine
adjHyp=1517
EC2 = √225+64
EC = √289
= 17
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