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3 years ago

PLEASE ANSWERS BOO'S!!!!

Mathematics

2 answers:

kiruha [24]3 years ago

7 0

The answer is a and remember to use the pythagorean theorem to answer these questions. The numbers are usually listed leg, leg, hypotenuse.

Brilliant_brown [7]3 years ago

3 0

Answer:

5, 12, 13

Step-by-step explanation:

Look at the first set of side lengths. If these lengths satisfy the Pythagorean Theorem, then we can correctly conclude that they represent a right triangle. Do the lengths 5, 12 and 13 satisfy the Pyth. Thm.?

In other words, does the sum of 5² and 12² equal 13²?

Does 25 + 144 =equal 169? YES. So yes, 5, 12 and 13 do represent a right triangle.

Second case: 4, 4 and 8. Does 16 + 16 equal 64? NO. Not a right triangle.

Third case: 2, 3, 4. Does 4 + 9 = 16? NO. Not a right triangle.

Summary: only 5, 12, 13 represent the side lengths of a right triangle.

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3 years ago

Read 2 more answers

What are the two missing sides of the triangle ??

igor_vitrenko [27]

Remark
It's a right triangle so the Pythagorean Theorem applies. All you have to do is put the right things in the right places of the formula.

Givens
a = x
b = x + 4
c = 20

Formula and Substitution.
a^2 + b^2 = c^2
x^2 + (x + 4)^2 = 20^2

Solution
x^2 + x^2 + 8x + 16 = 20 Collect the like terms on the left.
2x^2 + 8x + 16 = 20 Subtract 20 from both sides.
2x^2 + 8x + 16 - 20 = 0
2x^2 + 8x - 4 = 0 Divide through by 2
x^2 + 4x - 2 = 0

Use the quadratic formula
a = 1
b = 4
c = - 2

$\text{x = }\dfrac{ -b \pm \sqrt{b^{2} - 4ac } }{2a} 
$
$\text{x = }\dfrac{ -4 \pm \sqrt{4^{2} + 4(1)(2) } }{2} 
$

From which x = (-4 +/- sqrt(24) ) / 2
x1 = (- 4 +/- sqrt(4*6) ) / 2
x1 = (- 4 +/- 2 sqrt(6) ) / 2
x1 = -2 + sqrt(6)
x2 = -2 - sqrt(6) This is an extraneous root. No line can be minus.

x1 = + 0.4495
x2 = x + 4 = 4.4495

6 0

3 years ago