Question

Using Pythagoras' theorem, work out the

length of the hypotenuse of this right-angled
triangle.
Give your answer to the nearest centimetre.
7 cm
19 cm
Not drawn accurately

Answer 1

Explanation:

a² + b². =. c²

7² + 19². =. c²

49 + 361 (400). =. c²

. c = √400= 20cm

Answer 2

Answer: About 20.25 or
`√(410)`

Explanation:

a²+b²=c²

c is the hypotenuse in this equation, so we can substitute the given side lengths for a and b.

7²+19²=c²

49+361=c²

410=c²

Then we take the square root to get

about 20.25 or
`√(410)` to be exact