Answer:
1.
Perimeter of the triangle is =[tex]26+34+39[/tex] = 99 inches
2.
Area of triangle = [tex]\frac{1}{2}bh[/tex]
= [tex]\frac{1}{2}\times39\times21[/tex] = 409.5 square inches.
3.
Let the missing side be x
We get [tex]\frac{2}{3} =\frac{4}{x}[/tex]
=> [tex]2x=12[/tex]
x = 6
Hence, the missing side is 6 inches.
4.
The sum of the angles of a triangle is always 180 degrees.
