math
posted by hi, help hard questions .
5.
Find the length of the hypotenuse of a right triangle with legs of 20 cm and 21 cm.
41 cm
841 cm
6 cm
29 cm
6.
The length of the hypotenuse of a right triangle is 15 cm. The length of one leg is 9 cm. Find the length of the other leg.
6 cm
12 cm
17 cm
144 cm
7.
If the sail of a ship is 10 feet long and has a diagonal length of 26 feet, what is the height of the sail in feet?
29
24
17
8

all of these can be found using
a^2 + b^2 = c^2
where a and b are the legs, c the hypotenuse.
#7:
10^2 + b^2 = 26^2
b = 24
do the rest the same way, plugging two of the needed values.
if you get stuck, come on back and show how far you got.