Perimeter: x + (4x + 9) + (x + 11)
The value x is for the bottom of the triangle.
Simplified, it would be 6x + 20
x+142 =3x+64
subtract x from each side
142 = 2x+64
subtract 64 from each side
142-64 = 2x
78=2x
divide by 2
78/2 = x
x=39
The number is 39
The last one: the arc AB is a semicircle.
a semicircle is 180 degrees
Answer:
-1 -5 +9 = 3
Step-by-step explanation: