Question

Which property is true for ALL acute triangles?

They have three angles measuring less than 90˚.

They have at least two sides that are congruent to each other.

They have three congruent sides.

They have at least two congruent angles that measure less than 90˚.

Answer 1

any guesses?

Answer 2

acute angle means an angle less than 90 degrees
acute triangle means a triangle who's angles are all less than 90 degrees
also the sum of the angles within a triangle must equal 180 degrees
would a 61-60-59 degree triangle be acute?

Answer 3

is it D?

Answer 4

it would not be D
remember my example

a 59-60-61 degree triangle will still be an acute triangle because all angles are less than 90 and the sum is equal to 180

none of the angles are congruent to each other

Answer 5

so which one is it?

Answer 6

are you familiar with the law of sines?