Tuesday

July 22, 2014

July 22, 2014

Posted by **lisa** on Saturday, April 28, 2012 at 11:07am.

- math -
**Ms. Sue**, Saturday, April 28, 2012 at 11:24amYou can use the Pythagorean Theorem:

a^2 + b^2 = c^2

a^2 + 21^2 = 42^2

a^2 + 441 = 1764

a^2 = 1764 - 441

a^2 = 1323

a = 36.37 cm

**Related Questions**

Algebra - The perimeter of an equilateral triangle is 7 in. more than the ...

math - an equilateral triangle has an altitude length of 36 feet. determine the ...

geometry - An equilateral triangle has a side of 8. If one corner of the ...

math - triangle ABC has vertices A(3,4), B(4,-3) and C(-4,-1). a. draw a sketch ...

Math - A pentagon is formed by putting together three identical equilateral ...

math - construct an equilateral triangle ABC in which altitude drawn from ...

Math - The side of a square is 10 meters longer than the side of an equilateral ...

geometry - find the altitude of an equilateral triangle with side length twelve

math - what is the perimeter of an equilateral triangle if one side of the ...

algebra - Find the length of a side of an equilateral triangle with altitude of ...