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
In the diagram, O is the center of the circle, ∠MON = 80o, ∠LMO = 10o and ∠LNO = 15o. Calculat...
Simplify: x2−5x−14x2−9x+14 ...
P = {x:(x - 2)(x + 3) (x - 4)(x + 5) = 0}. The elements in P are ...
Alfred spent 14 of his money on food, 13 on clothing and save the rest. If...
The angle of a sector of a circle of diameter 8cm is 135°. Find the area of the sector [Take \(\...
Evaluate, correct to three decimal place 4.314×0.0000560.0067...