Answer:
42.5 cm to 3 sig figs
Explanation:
Use the Pythagorean Theorem:
x^2 + y^2 = z^2, where z is the hypotenuse (the side opposite the rght angle).
x = 30 cm
y = h cm
z = 52 cm
x^2 + y^2 = z^2
(30cm)^2 + (h)^2 = (52 cm)^2
900 cm^2 + (h)^2 = 2704 cm^2
(h)^2 = 1804 cm^2
h = 42.47 cm or 42.5 cm to 3 sig figs