Answer:
A
Step-by-step explanation:
The exterior angle is equal to the sum of the opposite interior angles.
Call the inside angle D
A+ B + D = 180 sum of the angles of a triangle is 180
C+D = 180 since the form a straight line
Solving for D
D = 180-C
Substitute this into the first equation
A+ B + 180-C = 180
Subtract 180 from each side
A+ B + -C =0
Add C to each side
A + B = C
This proves the theorem
Answer:
Second one and the fourth one.
Step-by-step explanation:
Let’s look at this. When we are finding the area of the rectangle, we multiply the length times the width. Let’s look at the first option.
2 times (x + 7)
2x + 14
this one won’t work.
second one:
14(x + 3)
14x + 42
this works.
thrid one.
14(x+5)
14x + 70
nope.
fourth one.
7(2x+6)
14x + 42
works.
fifth one,
2(7x +20)
14x + 40
Does not work.
Answer:
18
Step-by-step explanation:
108 + 4x = 180
4x = 72
x = 18
