Question

Which set of angles shows an obtuse triangle?
a) 71, 36, 73
b) 73, 91, 16
c) 90, 64, 26
d) 45, 82, 53

Answer 1

an obtuse triangle is a triangle that has one angle that is larger than 90 degrees

Answer 2

but less than 180 right ?

Answer 3

example:

Answer 4

yes, also less than 180

Answer 5

ohh okay, so I would add them & they would have to be greater than 90 but less than 180?

Answer 6

no, just a single angle

Answer 7

if any one angle is greater than 90 but less than 180, then it's part of an obtuse triangle

Answer 8

you're thinking of adding up the angles to get 180 (which verifies that you have a triangle in general)

Answer 9

they all equal 180 though

Answer 10

so they all form triangles, but which ones are obtuse triangles?

Answer 11

d?

Answer 12

d) 45, 82, 53

all angles here are less than 90, so this is an acute triangle

Answer 13

a? @jim_thompson5910

Answer 14

71 is less than 90

36 is less than 90

73 is less than 90

so all 3 angles are less than 90, so it is an acute triangle

Answer 15

so choice A is out

Answer 16

so its B?

Answer 17

yes, that second angle of 91 is larger than 90 degrees

Answer 18

so it's an obtuse triangle

Answer 19

thank you very much

Answer 20

you're welcome