We know that the interior angle sum of a polygon is (n − 2) × 180°, where <em>n</em> is the number of sides.
Here, number of sides (n) = 12
So, interior angle sum = (n − 2) × 180°
=> interior angle sum = (12 - 2) × 180°
=> interior angle sum = 10 × 180°
=> interior angle sum = 1800°
So, the interior angle sum of this polygon is 1800°.
Answer:
x=9
Step-by-step explanation:
These two angles are equal because they are corresponding angles and the two lines are parallel.
13x-7 = 11x+11
Subtract 11x from each side
13x-11x -7 = 11x-11x+11
2x-7 = 11
Add 7 to each side
2x-7+7 = 11+7
2x = 18
Divide each side by 2
2x/2 = 18/2
x =9
Hello!
3x + 5 = x - 10
Solve for x by isolating the variable.
Subtract 5 from both sides:
3x + 5 - 5 = x - 10 - 5
3x = x - 15
Subtract x from both sides:
3x - x = x - x - 15
2x = -15
Divide both sides by 2:
2x /2 = -15 / 2
x = -15/2.
Answer:
i think the first one
Step-by-step explanation:
