angles in a triangle = 180 degrees
70 +35 = 105 degrees
180-105 = 75 degrees
3rd angle = 75 degrees
Answer:
perimeter =
8
x
+
4
Explanation:
the perimeter of a rectangle is ∙ perimeter =
2
l
+
2
w
where l is the length and w the width
here
l=
3
x
−
2
and
w
=
x
+
4
⇒
perimeter =
2
(
3
x
−
2
)
+
2
(
x
+
4
)
←
distribute
⇒
perimeter =
6
x
-4
+
2+8
←
collect like terms
⇒
perimeter =
8
x
+
4
Step-by-step explanation:
The sum of angles in a regular octagon is
180*(8 - 2) = 1080°.
Each angle of the octagon is 1080/8 = 135°.
There are 8 equal central angles to each vertex.
Each central angle is 360/8 = 45°
Answer:
Therefore the octagon will map onto itself if it is rotated by its center through these angles:
45°
90°
135°
180°