Question

x, x+3, 15 obtuse

Answer 1

The sides and classification of a triangle are given. The length of the longest side is the integer given. What value(s) of x make the triangle?

Answer 2

--> Sakigirl --> gotta learn those theorems.
And, see if the Triangle Inequality Theorem is on that sheet.

Answer 3

Her theorems are listed as numbers.

Answer 4

x^2 + (x + 3) ^2 > 15^2 if thr triangle is obtuse.

It's all yours.

Answer 5

factoring?

Answer 6

I honestly just think I should go for tutoring. I'll just skip this one. I don't get it at all.

Answer 7

I agree on the tutoring because the theorems are fuzzy and frustration has set in.

See if you can do these -- they are a little different but the same concepts.

A triangle has sides of the given lengths. Is it acute, right, or obtuse?

a) 9, 40, 41

b) 6, 7, 8

c) 7, 8, 11

Answer 8

a. right
b. obtuse
c. obtuse

Answer 9

a) correct because 9^2 + 40^2 = 41^2

Answer 10

Let's look at these together.

Answer 11

c is the longest side.

Answer 12

c^2 = ... right

c^2 < .... acute

c^2 > ... obtuse

That's how i'm going to remember these theorems.

Answer 13

b) 8^2 ? 6^2 + 7^2

64 36 + 49

64 ??? 85

64 < 85

Triangle is acute

Answer 14

7,8,11

11^2 ??? 7^2 + 8^2

121 ??? 113

121 > 113

Triangle obtuse.