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Ryanlm

Answer of 9 = 7 because those red arcs mean that both of those angles are the same, so if the angle on the right is 7, the angle on the left is 7

Answer of 11 = 60, because this is a equilateral triangle, which means all the sides are the same.

180 - 60 = 120                    (180 is in the equation because all interior sides of a triangle add up to 180)

120 divided by 2 = 60

9. The slash marks represent that x is 7 since they are congruent angles.

11. x = 60

A triangle is 180 degrees. Given is a 60 degree angle. Also slash marks are shown.

x + x + 60 = 180

2x + 60 = 180

-60 -60

2x = 120

2x/2 = 120/2

x = 60

I hope this helps you, have a wonderful day!

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