Question

Find the slant height x of the pyramid shown, to the nearest tenth.

6mm
7mm
7mm

Options:
A: 4.35
B: 9.2
C: 6.9
D: 3.

Answer 1

C. 6.9

Explanation:

Pretend this is a 2-d diagram and use the Pythagorean theorem.

Pythagorean theorem: a^2 + b^2 = c^2

a = 6 mm

b = 7/2 = 3.5 mm

c = x

6^2 + 3.5^2 = x^2

36 + 12.25 = x^2

48.25 = x^2

`√(48.25) = √(x^2)`

x = 6.9