Determine the area of a triangle with sides of the following length:
a = 19 m
b = 20 m
c = 21 m

C

Step-by-step explanation:

The area of the triangle can be calculated using formula

where p is half of the perimeter.

1. If a=19, b=20 and c=21, then

2. The area is

is there a graph

step-by-step explanation:

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !