I not 100% sure but I chose C.
Hope this helps.. but good luck :)
Step-by-step explanation:
If there 5% is allowed in Rs 1,580 than the selling price of the watch is 1,501
Equilateral: all sides are the same length
isosceles: two sides are the same length
obtuse: there is 1 obtuse angle
36*40+36*40-6*6=2844ft^2
we had to subtract the area of the closet so it wasn't counted twice :P