Equal Tread
Riser
Stair Angle
A carpenter wants to build a staircase in which each riser has a height of 6 inches and each tread has a length of
11 inches.
Which of the following expressions is equal to the stair angle?
A sin
tan-1
11
csin
D tan

answer: (1,3) and (-2,0) i think.

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540