The lengths of the legs of a right triangle are 15 cm and 20 cm. What is the perimeter of the triangle? Note: You will need to use the Pythagorean theorem to find the hypotenuse. A. 35 cm B. 25 cm C. 60 cm D. 300 cm E. 20 cm

Question

The lengths of the legs of a right triangle are 15 cm and 20 cm. What is the perimeter of the triangle?   Note: You will need to use the Pythagorean theorem to find the hypotenuse.     A. 35 cm  B. 25 cm  C. 60 cm  D. 300 cm  E. 20 cm

directrix · Answer

Do you know the Pythagorean theorem?

phi · Answer

If you memorize 3,4,5  (and multiples of) is a right triangle, this is not too hard

anonymous · Answer

B. 25 cm

anonymous · Answer

more than positive

anonymous · Answer

i can teach you, if you'd like

anonymous · Answer

thank u

anonymous · Answer

you r big help!!!!!!!!

anonymous · Answer

...a... big help sorry

phi · Answer

@nona18  How can the perimeter be less than the sum of the 2 legs?

anonymous · Answer

sorry, i gave the hypotenuse not perimeter. 
perimeter is 60 so C.

phi · Answer

The pythagorean theorem says the longest side of a right triangle (call it c) is found using
$$ a^2 + b^2 = c^2 $$

You know a and b, so find c
then add them up to get the perimeter

directrix · Answer

C. 60 cm
Continuing from above:
15 + 20 + 25 = 60

phi · Answer

If you need help on pythagoras, see http://www.khanacademy.org/math/geometry/triangles/v/introduction-to-the-pythagorean-theorem

anonymous · Answer

were do i go to ask more ?