*

*
*

Notice the we can simplify

*
by separating into the product of two square roots:

*
.

You are watching: Can an equilateral triangle be a right triangle

EXAMPLE1:Find the exact length the the side marked x in the triangle on the right:
*

SOLUTION: "Exact" means we must offer a simplified answer involving square roots. In this triangle, side

*
is the hypotenuse, so we collection its size to 2a: 8 = 2a. Thus, a = 4, and since next
*
is adjacent the 30oangle, its size is
*
, for this reason in this case
*
.

EXAMPLE2:Find the specific length that the hypotenuse in this appropriate triangle:
*
SOLUTION:

*
, for this reason
*
, and
*
. We have to simplify this by rationalizing the denominator. We perform that by multiply top and bottom through
*
:
*
. The hypotenuse is
*
.

*

*

*
,
*
,
*
.

*

*
in length.
*

SOLUTION: In this case

*
, for this reason the hypotenuse

is

*
.

Integer ideal Triangles

Another type of special ideal triangle is one "integer right triangle." that is a ideal triangle who side-lengths are whole numbers. The converse the the Pythagorean Theorem wake up to be true (and can conveniently be proved from SSS). That is, if the political parties of a triangle are a, b and also c, and

*
then the triangle is a ideal triangle. As soon as a, b and c are totality numbers then the triangle is an integer ideal triangle and also the triple (a, b, c) is dubbed a "Pythagorean Triple," as you learned in class 2.

The many "primitive" Pythagorean triple is (3, 4, 5). Any kind of common lot of of these numbers is additionally a Pythagorean triple. That is, if k is any whole number, climate (3k, 4k, 5k) is a Pythagorean triple, because:

*

*

For example, (6, 8, 10) and also (9, 12, 15) room Pythagorean triples.

Other Pythagorean triples are (5, 12, 13), (8, 15, 17) and (7, 24, 25). In fact, if m and also n are entirety numbers and m > n, then

*
is a Pythagorean triple, as can be verified using algebra.

Examples of Integer right Triangles

EXAMPLE4:What is the measure of edge Q in the triangle ~ above the right?
*

SOLUTION:This is no an isosceles or it is provided triangle, and also we understand only the side-lengths, so the answer is not obvious, however it might be a right triangle. If we let c be the biggest side-length and also a and b the others, we examine to watch if

*
:

*
?

400 + 441 = 841

841 = 841

It is a ideal triangle, and

*
is the hypotenuse. Therefore angle Q is 90o.

Exact Answers

As you learned in lesson 2, that is sometimes preferable to offer "exact answers" because that the political parties of triangles. This way the lengths space given in its entirety numbers, fractions, or streamlined square roots. Because the square source of a product is the product of the square roots, a square source of a whole number have the right to sometimes be "simplified" by break the number inside right into the product that a perfect square and another totality number. The following instance shows how to simplify a square root:

EXAMPLE 5: simplify

*

SOLUTION: we wish to aspect 567 right into the product that the largest perfect square we can find and also another totality number. Very first we list perfect squares no larger than half of 567:

Number Perfect Square

1 1

2 4

3 9

4 16

5 25

6 36

7 49

8 64

9 81

10 100

11 121

12 144

13 169

14 196

15 225

16 256

Then we begin at the bottom that the Perfect Square list and work our method upward to uncover the biggest perfect square the divides 567 evenly. We eliminate 256, 225, 196, 169, 144, 121, and 100 before we discover that 81 works:

*
. Thus,
*
, so
*
.

EXAMPLE6:Find the simplified specific length of next
*
in the triangle top top the right.

See more: You Can You See Smell And Taste Microorganisms ? You Can See, Smell, And Taste Microorganisms

*

SOLUTION: allow DE = x. Through the Pythagorean Theorem,

*
. For this reason
*
,
*
. Now we should simplify
*
: We begin by listing the perfect squares much less than 40. They space 1, 4, 9, 16, 25, 36. 36 and also 25 execute not get in 80, however 16 does:
*
, therefore
*
and
*
=
*
. That is,
*
.