Question

Use the Triangle Sum Property to solve for x. Use the value of x to find the angle measures of the triangle.

20, 30, 130
36, 72, 72
40, 60, 80
50, 55, 75

Answer 1

What do all 3 angles add to in any triangle?

Answer 2

180

Answer 3

so this means

(3x) + (2x) + (3x-20) = 180

3x + 2x + 3x-20 = 180

(3x + 2x + 3x) - 20 = 180

8x - 20 = 180

I'll let you finish

Answer 4

8x - 120 = 180
8/8 = x
120 / 8 = 15

so x = 15

2x or 2(15) = 30

3x - 20 or 3(15) - 20 = 25

3x or 3(15) = 45

But that doesn't make sense , what am i doing? e.o

Answer 5

it's 8x - 20 not 8x - 120

Answer 6

ooooh xD

Answer 7

8x - 20 = 180
8/8 = x
20/8 = 2.5

so x = 2.5?

Answer 8

8x - 20 = 180

8x - 20+20 = 180+20 ... Add 20 to both sides.

8x = 200

x = ???

Answer 9

x = 25

Answer 10

good

Answer 11

now you use that x value to find the 3 angles

Answer 12

50, 55, 75

Answer 13

correct

Answer 14

thanks! ^_^

Answer 15

np