david plans to cover the floor of his room with new material.
the floor is an isosceles trapezoid whose bases are 16 feet and 26 feet
and sides are 13 feet in length. each piece of new material has an area of 2.5 square feet.
assuming the pieces of new material can be cut as needed, how many pieces does
david need?
101
126
202
252

Step-by-step explanation:

1. Calculate the area of the floor

The formula for the area of a trapezoid is  

A = ½(a + b)h,

where a and b are the lengths of the parallel sides and h is the distance between them.

However, we are not given the value of h, so we must use Brahmagupta's formula.

If the four sides are a, b, c, and d, the area A is

where s is the semiperimeter

Data:

a = 13 ft

b = 16 ft

c = 13 ft

d = 26 ft  

(a) Calculate the semiperimeter

(b) Calculate the area

The area of David's floor is 252 ft².

2. Calculate the number of pieces of material

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )