Question

The sum of the measures of two exterior angles of a triangle is 260. What is the measure of the third exterior angle ?
A) 80
B)100
C) 110
D) 90

Answer 1

The sum of the exterior angles of any polygon is 360 degrees.
A triangle has 3 exterior angles. Two of them add up to 260 degrees.
So the third must be ?

Answer 2

100 lol

Answer 3

yay!

Answer 4

180-A + 180-B = 260

Answer 5

Alright you got it lol

Answer 6

Do you guys want to help me with a couple more problems ? i really need the help i don't understand Geometry at all lol

Answer 7

post them.

Answer 8

how many sides does a regular polygon have if each exterior angle measures 40 ?
A) 9 sides
B) 12 sides
C) 8 sides
D) 11 sides

Answer 9

Same statement made above is true here also.
The sum of the exterior angles of ANY polygon is 360 degrees.
Let this polygon have N sides. That means it has N exterior angles.
N exterior angle adds up to 360. One exterior angle = 360 / N = 40
N = 360 / 40 = 9 sides.

Answer 10

Find the values of the variables in the parallelogram. The diagram is not drawn to scale .
A) x=52, y=60, z=68
B) x=60, y=68, z=52
C) x=60, y=52, z=68
D) x=52, y=68, z=68

Answer 11

The opposite angles of a parallelogram are equal. So z = 68.
52 and y are alternate interior angles because the left and right sides are parallel.
So y = 52.
The sum of angles of a triangle is 180. So x+y+68 = 180
x+52+68 = 180. x + 120 = 180. x = 60
x=60, y=52, z=68

Answer 12

For the parallelogram, if m<2=3x-28 and m<4=2x-12, find m<3 . The diagram is not drawn to scale.
A) 20
B) 16
C) 160
D)170

Answer 13

Opposite angles of a parallelogram are equal. son angle 2 = angle 4
3x-28 = 2x-12
can you solve for x? Then we can find angle 3.

Answer 14

is the answer for this problem 16 ? that's what I got but idk if I did it right . lol

Answer 15

No that is the value of x and 16 is correct.
Put it in the angle for 4: 2x-12 = 2(16) - 12 = 32 - 12 = 20.
In a parallelogram, the angle 4 and angle 3 add to 180.
so angle 3 = 180 - 20 = 160.

Answer 16

ABCD is a parallelogram. The diagram is not drawn to scale. If m<CDA=128, then m<ABC=_____
A) 125
B) 128
C) 52
D) 120

Answer 17

Opposite angles of a parallelogram are equal. Therefore, angle ABC = ?

Answer 18

128

Answer 19

Yes.

Answer 20

ABCD is a parallelogram. Find AE, if BD= 12, and AC=18
A) 12
B) 18
C) 9
D) 6